The Bulletin of
The Canadian Association
of Physicists
Vol. 36 No. 3
Congress Issue 1980
Bulletin de
l'Association canadienne
des physiciens
Vol. 36 N° 3
Numéro du Congrès 1980
1+
Third Troisième
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Physics in
Canada
The Bulletin of
The Canadian Association
of Physicists
Vol. 36 No. 3
Congress Issue 1980
Bulletin de
l'Association canadienne
des physiciens
Vol. 36 N° 3
Numéro du Congrès 1980
EDITORIAL B O A R D / C O M I T É DE RÉDACTION
La Physique
au Canada
R é d a c t e u r en c h e f / E d i t o r
E. R. Fortin
D é p t . de Physique. Université d ' O t t a w a (613) 231-5803
T A B L E O F C O N T E N T S / S O M M AI R F
P a g t • No.
A s s o c i a t e E d i t o r / R é d a c t e u r Associé
M . L. Jento
Officers of the A s s o c i a t i o n
Managing/Administration
Industrial E d i t o r / A f f a i r e s industrielles
H. Naguib
1980 C o n g r e s s , G e n e r a l I n f o r m a t i o n
ii
iii
C o n g r è s 1980, R e n s e i g n e m e n t s g é n é r a u x
A Study of F u t u r e Research O p p o r t u n i t i e s in Physics
iii
vii
viii
AAPT-Ontario Conference
Form/Formule
Bell N o r t h e r n Research. Ottawa
vii /viii
Book Review E d i t o r / R é d a c t e u r à la critique des livres
Maps/Plans
R. C. Smith
C A P M e d a l l i s t s 1 9 8 0 / L a u r é a t s de I ' A C P 1980
ix. x, xi
xii
C A P Prize E x a m 1 9 8 0 / E x a m e n de I ' A C P 1980
Future Congresses/Congrès futurs
xii
University o f Ottawa
Laboratoires G o u v e r n e m e n t a u x / G o v e r n m e n t Labs.
xii
Exhibitors/Exposants
J. Rolfe
xiii
xiv
I n s t r u c t i o n s for Timed Papers
Physics Div.. N R C . Bldg. M-36. M o n t r e a l Rd.. O t t a w a (613) 993-2046
Invited S p e a k e r s / C o n f é r e n c i e r s invités
Community Colleges/Colleges C o m m u n a u t a i r e s
P r o g r a m S u m m a r y / R é s u m é du p r o g r a m m e
C o n g r e s s P r o g r a m / P r o g r a m m e du C o n g r è s
P. E. Kellv
xv
xvi
1
51
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Rédacteurs Régionaux/Régional
Bring this free copy o f the Congress Issue to the annual congress
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OFFICERS OF THE ASSOCIATION/BUREAU DE DIRECTION
COUNCIL/CONSEIL:
1979-80
•President
•Past President
•Vice-President
•Vice-President Elect
•Honorary Secretary-Treasurer
Director - Members
Director - A f f i l i a t e s
Director - Student Members
Director - Corporate Members
P.A. Forsyth
R.R. Haering
C.C. Costain
P. Marmet
A.G. McNamara
D.W.L. Sprung
T.W.R. East
K. Ragan
W.A. Pleczonka
University of Western Ontario
University of B r i t i s h Columbia
National Research Council, Ottawa
Université Laval
National Research Council, Ottawa
McMaster University
Raytheon Canada Ltd.
University of Alberta
Linear Technology I n c . , Burlington
C.D. Anger
J.D. Poll
D.W. Strangway
M.F. Collins
P. O'Brien
D.M. Sheppard
F. Rheault
F.D. Measday
J.D. Stevens
H.W.H. van Andel
B. Bergersen
D. Smeaton
University of Calgary
University of Guelph
University of Toronto
McMaster University
Calgary Cancer C l i n i c
University of Alberta
INRS - Energie
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University of Guelph
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A.A. Offenberger
(1)
(2)
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University of Alberta
Saskatchewan and Manitoba
P.D. Loly
J. Pachner
(1)
(2)
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University of Regina
Ontario - Southwest
K.R. J e f f r e y
J. Vanderkooy
(1)
(2)
University of Guelph
University of Waterloo
Ontario - Central and North
V.V. Paranjape
R.H. Prince
(1)
(2)
Lakehead University
York University
Ontario - East
W.M. Zuk
P.C. Shragge
(1)
(2)
Radiation Protection Bureau (Ottawa)
Ontario Cancer Foundation, Kingston
Québec
J.G. Martel
J.-D. Carette
(1)
(2)
CREN/INRS, Université du Québec
Université Lava11
New Brunswick and Newfoundland
T. Vo-Van
M.J. Clouter
(1)
(2)
Université de Moncton
Memorial University of Newfoundland
Nova Scotia and Prince Edward Island
B.E. Paton
M.O. S t e i n i t z
(1)
(2)
Dalhousie University
St. Francis Xavier University
At Large
A.B. McDonald
T.W. Johnston
(1)
(2)
Chalk River Nuclear Laboratories
INRS - Energie, Varennes
EDITOR - CANADIAN JOURNAL OF PHYSICS
P.R. Wallace
EDITOR - PHYSICS IN CANADA/
LA PHYSIQUE AU CANADA
E.R. Fortin
EXECUTIVE SECRETARY/SECRETAIRE EXECUTIF
M.L. Jento
McGill University
University of Ottawa
•Member of Executive Committee (Revised By-Laws 1973, A r t . V, Sec.2)
(1) Term ends June 1980; (2) Term ends June 1981
CORPORATE MEMBERS - 1980
MEMBRES CORPORATIFS - 1980
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iii
RENSEIGNEMENTS GENERAUX
GENERAL INFORMATION
L'université McMaster sera l'hôte du 35 e congrès
annuel de l'Association canadienne des Physiciens
du lundi 16 juin au jeudi 19 juin 1980.
L'Université McMaster est à l'extrémité ouest de
la ville de Hamilton, à environ 3 milles du
centre ville.
McMaster University will host the thirty-fifth
annual Congress of the Canadian Association of
Physicists from Monday, June 16th to Thursday,
June 19th, 1980. McMaster University is located
in the City of Hamilton, Ontario, about three
miles west of the city centre.
ARRIVEE
ARRIVAL
On peut se rendre à Hamilton par deux aéroports
commodes: le service d'autobus de l'aéroport
international de Toronto dessert le Royal Connaught
Hotel, au centre de Hamilton, toutes les 40
minutes; le voyage prend 1 heure et coûte $7.50.
De l'aéroport municipal de Hamilton, toutes les
40 minutes; le voyage prend 1 heure et coûte $7.50.
De l'aéroport municipal de Hamilton (Mount Hope)
il y a un autobus pour chaque vol; cet autobus
se rend également au Royal Connaught Hotel et
coûte $3; le voyage dure environ 20 minutes.
Hamilton can be reached from two convenient
airports. The Airport Bus Service from Toronto
International Airport runs every forty minutes to
the Royal Connaught Hotel in central Hamilton;
the trip takes one hour and costs $7.50. From
Hamilton Civic Airport (Mount Hope) there is a
bus which serves every flight; this also runs
to the Royal Connaught Hotel and costs $3; the
trip takes about 20 minutes.
Du Royal Connaught à l'université le coût du taxi
est environ $5; toutefois, il y a de fréquents
autobus de la ville qui vont directement au campus,
au tarif de 0,50 dollars, monnaie exacte (lignes
5c, West Hamilton, et 5D, University). On peut
également prendre un taxi directement de l'aéroport
international de Toronto à l'université au prix
d'environ $30 et de l'aéroport municipal de
Hamilton au coût d'environ $12.
Les délégués qui arrivent en voiture par le QEW
de Toronto ou de Niagara doivent entrer dans
Hamilton par la route 403 et sortir à "West Main".
Tourner à gauche au premier feu de circulation
(Main Street West, Routes 2 et 8); l'Université
est à droite à moins d'un mille.
From the Royal Connaught to McMaster University
the taxi fare is approximately $5.00; however,
there are city buses which run frequently and
directly into the campus and the fare is 50ç,
exact change (routes 5C, West Hamilton, and 5D,
University). Taxis direct to the University
may be taken from Toronto International Airport
at a cost of about $30, and from Hamilton Civic
Airport at a cost of about $12.
Delegates arriving by road on the QEW from
either Toronto or Niagara should take highway
403 into Hamilton and take the exit labelled
"West Main Street". Turn left at the first
stop light (Main Street West, Highways 2 and 8)
and the University is on the right in less than
one mile.
Les délégués qui ont fait des réservations de
logement sur le campus se rendront directement au
Commons Building, après être entrés sur le campus
à l'entrée de Sterling Street. Les délégués qui
désirent se rendre directement aux sessions
de l'assemblée entreront sur le campus par Main
Street West et se gareront près du Senior Sciences
Building.
Delegates with reservations for on-campus
accommodation should proceed directly to the
Commons Building, entering the campus at the
Sterling Street entrance. Delegates wishing
to proceed directly to the sessions of the
meeting should enter the campus from Main Street
West and should park near the Senior Sciences
Building.
En cas de difficulté, on peut prendre contact
avec le Comité local à (416) 252-9140, poste
4569 et 4558.
In case of difficulty the Local Committee may
be contacted at (416) 525-9140, extension 4569
and 4558.
STATIONNEMENT
PARKING
Il y aura des places de stationnement pour les
délégués résidant sur le campus près du Commons
Building. Ce stationnement est gratuit, pourvu
que la voiture porte sur son pare-brise le permis
fourni 3 l'arrivée à la résidence. Les délégués
qui résident en dehors du campus peuvent garer
leur voiture près du Senior Sciences Building au
coût de $2 par jour.
Parking facilities for delegates residing on
campus will be available near the Commons
Building. This is free of charge so long as the
permit provided on check-in at the residence is
displayed in the windscreen of the car.
Delegates living off campus may park near the
Senior Sciences Building at a cost of $2 per
day.
iv
INSCRIPTION
REGISTRATION
L'inscription pourra se faire de 16 à 22heures
dans le foyer du Commons Building le dimanche
15 juin, et ensuite tous les jours à partir de
8h30 dans la salle 274 du Senior Sciences
Building. C'est là que se tiennent la plupart
des sessions du Congrès. Les droits d'enscription
sont les suivants:
Registration will be held from 4:00 p.m. to
10:00 p.m. in the foyer of the Commons Building
on Sunday, 15th June and thereafter from 8:30
a.m. each day in Room 274 of the Senior Sciences
Building. This building is where most of the
Congress sessions will be held. The schedule of
registration fees is as follows:
CAP Members
Non-Members
Graduate Students, Undergraduate Students,
and High School Teachers
Membres de l'ACP
$40.00
Non-membres
$50.00
Etudiants gradués, Enseignants
du secondaire et étudiants sous-gradués...$10.00
On pourra se procurer les billets pour le banquet
de l'ACP et pour les fonctions sociales au
bureau d'inscription.
Tickets for the CAP Banquet and for social
events will be available at the registration
desk.
REPAS
MEALS
Les délégués logés dans les
prendre leur petit déjeuner
Building de 7h30 à 9h30; il
forfait de logement, et les
également l'acheter.
résidences pourront
dans le Commons
est compris dans le
non-résidents peuvent
Delegates staying in the Residences will be
served breakfast in the Commons Building from
7:30 a.m. to 9:30 a.m. as part of the accommodation package. It may be purchased also by
non-residents.
La cafétéria du sous-sol du Senior Sciences
Building sera ouverte du lundi au mercredi pour
l'usage exclusif des délégués du Congrès. On
prévoit un déjeuner barbecue et on offrira
également de la bière de llhOO à 17h30.
The cafeteria in the basement of the Senior
Sciences Building will be open Monday through
Wednesday exclusively for delegates to the
Congress. A barbecue lunch is planned and beer
will also be available from 11 a.m. to 5:30 p.m.
De plus, il y a des cafétérias sur le campus dans
le Health Sciences Centre et dans Togo Salmon
Hall. Le Faculty Club est également ouvert pour
déjeuner et dîner (sauf le dimanche) pour les
invités des membres ou pour les membres de
Faculty Clubs disposant de privilèges de
réciprocité.
In addition, there are campus cafeterias in the
Health Sciences Centre and in Togo Salmon Hall.
The Faculty Club is also available for lunch
and dinner (closed Sundays) for guests of
members or for those belonging to faculty clubs
with reciprocal membership privileges.
Parmi les autres restaurants à portée du campus,
on note le Steak 'n Burger sur Main Street West
immédiatement à l'ouest du campus, le Sunshine
Restaurant sur Main Street West â un demi-mille
à l'est du campus et Mothers Pizze Parlour sur
King Street West à environ 3/4 de mille à l'est
du campus.
Other restaurants within walking distance of
the campus include the Steak 'n Burger on Main
Street West immediately west of the campus,
the Sunshine Restaurant on Main Street West
half a mile east of the campus and Mothers
Pizza Parlour on King Street West about 3/4 of
a mile east of the campus.
RAFRAICHISSEMENTS
REFRESHMENTS
On servira le café et le thé au milieu de la
matinée et au milieu de l'après-midi. On pourra
se procurer de la bière avec le déjeuner et
pendant l'après-midi dans la cafétéria du sous-sol
du Senior Sciences Building.
Coffee and tea will be available mid-morning and
mid-afternoon. Beer is available with lunch
and in the afternoons in the cafeteria in the
basement of the Senior Sciences Building.
EXPOSITION TECHNIQUE ET D'EDITION
TECHNICAL AND PUBLISHING EXHIBITION
L'exposition d'équipements techniques et livres
aura lieu dans le Senior Sciences Building à
proximité immédiate des salles de conférence.
On trouvera ci-dessous une liste des exposants
inscrits au 9 avril, et le nécessaire
d'inscription contiendra une liste finale.
The technical equipment and book exhibition will
be located in the Senior Sciences Building in
the immediate vicinity of the lecture rooms. A
list of exhibitors as of April 9th is included
on a later page, and a final list will be
provided in the registration package.
ix
ACTIVITES MONDAINES
SOCIAL EVENTS
Nous pensons bien que tous les physiciens seront
complètement occupés tous les jours, mais nous
espérons tout de même assurer un programme de
divertissement pour ceux qui ne sont pas aussi
occupés. Nous en donnons une liste ci-dessous,
et vous pressons d'indiquer vos intentions à
l'avance de manière que nous puissions servir au
mieux vos intérêts.
While we expect all the physicists to be fully
engaged all day every day, we are hoping to
provide a diverting program of events for
those not so busy. These are listed below and
we would urge you to indicate your intentions
in advance so that we may better care for your
interests.
1. Réception
1. Reception
dimanche, 15 juin
Les physiciens de McMaster et leurs conjoints
désirent accueillir les visiteurs et refaire
de vieilles connaissances le dimanche soir de
19h30 à 22h00 dans le Vallance Memorial Dining
Room du Commons Building. Tous les délégués
sont invités avec leurs familles.
2. Visite à Toronto
lundi, 16 juin
Une journée de magasinage avec déjeuner au
Toronto Eaton Centre et l'après-midi dans la
région de Yorkville/Hazelton Lanes. Il y
aura un guide. Le déjeuner n'est pas
compris - $13.00
3. Le Moulin d'Ancaster
mardi 17 juin
Visite et café au moulin historique d'Ancaster.
Déjeuner au Hillside Racquets Club. Les
athlètes de plus de onze ans peuvent jouer au
tennis; les autres peuvent regarder.
$11.50
4. Théâtre du Festival Shaw
mardi 17 juin
Nous avons réservé un certain nombre de places
pour "La puce à l'oreille" farce française de
Feydeau dans la meilleure tradition du genre.
Cette pièce est offerte au Théâtre du Festival
Shaw dans la ville historique de Niagara-onthe-Lake. Le prix comprend le transport en
autobus et un (véritable) souper gastronomique
en chemin. On aura le temps de voir la ville.
Départ à 18h00 du Commons Building, lever de
rideau à 20h30. $25.00. Vous pouvez également
quitter le Commons Building après diner à
18h45; il vous en coûtera alors $17.50.
5. Dundurn Castle
mercredi 18 juin
Visite du monument historique du Dundurn Castle.
Déjeuner-buffet sur les terres du château.
Visite des fameux Rock Gardens, llhOO à 15h00.
$13.00
6. Banquet
mercredi 18 juin
L'Université McMaster et la ville de Hamilton
seront les hôtes d'une réception â la Hamilton
Art Gallery â 18h30. Une visite de la galerie
commencera à 18h00, pour les personnes qui
désirent voir la galerie avant la réception.
Ensuite, il y aura le banquet de l'ACP au
Studio Theatre de Hamilton Place (en face de
la galerie) à 19h30.
L'autobus part du
Commons Building à 17h30 pour la visite de la
galerie et 18h00 pour la réception. Il y
aura un autobus pour le retour. $14.00
Sunday, 15 June
McMaster physicists and their spouses wish
to welcome visitors and renew old acquaintances
on Sunday evening from 7:30-10:00 p.m. in the
Vallance Memorial Dining Room of the Commons
Building. All delegates and their families
are invited.
2. Toronto trip
Monday, 16 June
A day of shopping and lunch in Toronto Eaton
Centre and afternoon in Yorkville/Hazelton
Lanes area. Guide provided. Lunch not
included - $13.00
3. Ancaster Mill
Tuesday, 17 June
Tour and coffee at the historic Ancaster Mill.
Lunch at Hillside Racquets Club. Athletes
over eleven may play tennis; others can
watch. $11.50
4. Shaw Festival Theatre
Tuesday, 17 June
We have booked a limited number of seats for
"A Flea in Her Ear", a French farce by
Feydeau in the best tradition of the genre.
It is being featured at the Shaw Festival
Theatre in historic Niagara-on-the-Lake. Bus
transportation and a gourmet (truly) supper
en route are included. There will be time to
see the town. Departure time is 6:00 p.m.
from the Commons Building and curtain time is
8:30 p.m. $25.00. Alternately you may depart
from the Commons Building after dinner at
6:45 p.m., when the cost will be $17.50
5. Dundurn Castle
Wednesday, 18 June
Tour of historic Dundurn Castle. Buffet
lunch on the castle grounds. Visit to the
famous Rock Gardens. 11 a.m. to 3 p.m.
$13.00
6. Banquet
Wednesday, 18 June
McMaster University and the City of Hamilton
will host a reception in the Hamilton Art
Gallery at 6:30 p.m. A gallery tour is
arranged to start at 6:00 p.m. for those
wishing to see the gallery before the
reception. The CAP Banquet will follow in
the Studio Theatre of Hamilton Place (across
from the Art Gallery) at 7:30 p.m. Bus
transportation from the Commons Building
leaves at 5:30 p.m. for the gallery tour and
6:00 p.m. for the reception only. Return bus
transportation provided. $14.00
vi
7. Installations de loisirs
7. Recreational Facilities
En plus des Installations de loisirs que l'on
trouve dans la ville, les délégués du Congrès
peuvent faire usage de la piscine, des courts
de squash et des autres installations du
Physical Education Complex, au prix de $1.00
par personne et par Jour. On trouvera les
détails dans les vestiaires hommes et femmes
Veuillez comprendre que pour pouvoir assurer les
réservations à ces diverses fonctions sociales,
il nous faut savoir bien à l'avance le nombre de
participants. Il est par conséquent essentiel
de remplir et renvoyer le formulaire â la
page vil avant le 1er juin â:
In addition to recreational facilities
available in the city, Congress delegates
may use the swimming pool, squash courts and
other facilities in the Physical Education
Complex at a charge of $1.00 per person per
day. Details available at the men's and
women's locker rooms of the Physical Education
Please understand that in order to ensure
bookings for these events, we must know well
ahead of the Congress week how many will
participate. It is therefore essential that
the tear-off form on page viii be returned by
June 1 to:
CAP Congress
Department of Physics
McMaster University
Hamilton, Ontario
L8S 4M1
VISITES AUX LABORATOIRES DE RECHERCHE
VISITS TO RESEARCH LABORATORIES
On organisera des visites du Réacteur nucléaire
et du Van de Graaf Tandem de l'Université McMaster.
Ces visites sont prévues pour le mardi après-midi
17 juin. De plus, divers autres laboratoires
de recherche seront ouverts aux délégués du
Congrès sur rendez-vous. Ceux qui désirent
participer à ces visites devront demander des
détails au bureau d'inscription.
Tours will be arranged for the McMaster University
Nuclear Reactor and the Tandem Van de Graaff.
These will be scheduled on Tuesday afternoon,
17th June. In addition various other research
laboratories will be open to Congress delegates
by arrangement. Those wishing to participate
should check for further details at the
registration desk.
CENTRE D'EMPLOI
JOB CENTRE
Au Congrès de l'ACP à McMaster il y aura un bureau
de renseignements et un tableau d'affichage dans
la salle 274 du Senior Sciences Building. On
pourra également utiliser des salles d'entrevue
selon les besoins. Les objectifs principaux du
Centre sont de servir de bourse d'information
entre les employeurs et les employés en puissance,
et d'encourager la préparation d'entrevues entre
les candidats et les employeurs. Si vous désirez
vous Inscrire à l'avance ou faire afficher votre
nom sur le tableau d'affichage sans participer
au Congrès, veuillez écrire à:
At the CAP Congress at McMaster there will be an
information desk and bulletin board in Room 274
of the Senior Sciences Building. Interview rooms
will also be available as required. The primary
objectives of the Centre are to act as an
information exchange Centre between prospective
employers and employees and to promote the
arrangement of interviews between applicants and
employers. If you wish to register in advance
or to have your name posted on the bulletin
board without attending, please write to:
CENTRE DE L'EMPLOI
ASSOCIATION CANADIENNE DES PHYSICIENS
151 SLATER, SUITE 903
OTTAWA, ONTARIO KIP 5H3
(613) 237-3392
JOB CENTRE
CANADIAN ASSOCIATION OF PHYSICISTS
151 SLATER STREET, SUITE 903
OTTAWA, ONTARIO KIP 5H3
(613) 237-3392
LOCAL COMMITTEE
COMITE LOCAL
Président
Programme local et banquet
Exposition
Centre de l'emploi
Publicité
Salles de conférence
Visite des laboratories
Inscription et hebérgement
Malcolm F. Collins
Frances A. Cameron
John A. Cameron
W. Ross Datars
Archie A. Harms
Martin W. Johns
Carl V. Stager
Robert G. Summers-Gill
Devi Symons
Jack S. Kirkaldy
Donald W.L. Sprung
On peut prendre contact avec le Comité Local au
Bureau de Département de Physique, Senior Sciences,
salle 241, téléphone (416) 525-9140, local 4569
ou 4558. Le Bureau exécutif de l'Association
sera situé salle 256 du Senior Sciences Building.
S'il se produit une urgence quelconque sur le
campus appelez le numers d'urgence local 4281.
Chairman
Social and Banquet
Exhibits
Job Centre
Publicity
Audio Visual and Lecture Halls
Laboratory Tours
Registration and Accommodation
The Local Committee may be contacted at the
Physics Department Office, Senior Sciences
Room 241, phone (416) 525-9140, extension 4569
or 4558. The CAP Executive Office will be in
Room 256 of the Senior Sciences Building. The
University Security can be reached on extension
4281.
vii
A STUDY OF FUTURE RESEARCH OPPORTUNITIES IN PHYSICS
NSERC has agreed to fund the proposals of CAP to undertake an Iterative consultative project among its
members in each of the following subject areas:
Nuclear and Particle Physics
Plasma Physics and Fusion
Atomic and Molecular Physics
Optical Physics
Condensed Matter Physics
The purpose:
To define the best directions in which research should progress over, say, the next five
years. (In some areas this is an inappropriately short time frame. For such areas longer
and medium term goals should be defined.)
To outline an appropriate and feasible role for Canadian scientists in relation to the
world-wide development of the area.
To define the resources needed in terms of existing or achievable manpower levels, funding,
equipment, installations or organizational structures to achieve an appropriate and fruitful
level of activity. The effects on the quality and productivity of the science resulting
from possible variations or imbalances among the various resources should be assessed.
The end product of each study will be a background document for use by the NSERC Physics and Astronomy
Committee and by other government agencies to assist in decisions which affect the development of that
particular area of science. Each document will represent the best available consensus among the
scientists active in the area in Canada. Each area of physics should be looked at as a whole without
regard to the performing sector (I.e. government, university or industrial lab).
The quality and usefulness of the document will depend strongly on the voluntary efforts of many members
of CAP. Although the CAP cannot legally commit the membership to make this voluntary contribution the
Executive of CAP will undertake to use Its best efforts to ensure an effective consultative process.
Detailed terms of reference, the timetable and procedure have been mailed by the divisional chairmen
to members of concerned divions. For some of the fields, discussion meetings have been scheduled
in the Program. In others the initial briefing will take place at the Annual Business Meeting of
the Division.
All members are urged to participate, to ensure that their ideas, which might well cross divisional
boundaries, reach the appropriate study groups.
Nom
Affiliation
Veuillez reserver
lundi -
place(s) pour les fonctions suivantes:
Une journée de magasinage avec déjeuner au Toronto Eaton Centre
et l'après-midi dans la région de Yorkville/Hazelton Lanes.
Il y aura un guide.
Le déjeuner n'est pas compris - $13.00 par personne
mardi
matinée
Visite et café au moulin historique d'Ancaster. Déjeuner au
Hillside Racquets Club. Les athlètes de plus de onze ans
peuvent jouer au tennis; les autres peuvent regarder.
$11.50 par personne
mardi
soirée
-
Excursion en autobus à Niagara-on-the-Lake et souper,
II y aura le temps de voir la ville.
"A Flea in Her Ear" et souper - $25.00 par personne
Départ plus tard, souper non-inclus - $17.00 par personne
mercredi 11:00 â
15:00 h
Visite du monument historique du Dundurn Castle. Déjeuner-buffet
sur les terres du château. Visite des fameux Rock Gardens.
mercredi soirée
Banquet de l'ACP ave
avec visite et réception à la Art Gallery.
„„
$14.00 par personne
RETOURNER A:
CAP CONGRESS A L'UNIVERSITE MCMASTER
•
•
•
•
•
$13.00 par personne
. .
I 1
(english on reverse)
vili
AAPT-ONTARIO CONFERENCE
June 13-14
If you are planning to attend the CAP conference at McMaster, you may well be interested also in attending
the second annual conference of the Ontario Section of the American Association of Physics Teachers
(AAPT-Ontario). This meeting will be held just prior to the CAP conference, on June 13 and 14 (Friday
and Saturday) at Trent University in Peterborough, Ontario.
AAPT-Ontario was founded in January, 1979 and now boasts over 250 members. Approximately 150 are
secondary school teachers; the rest are University and College faculty. The Ontario Section is
affiliated with the international AAPT, a 10,000-member organization which is well known for its
publication of the "American Journal of Physics" and "The Physics Teacher", and for its semiannual
conferences often held jointly with the American Physical Society.
AAPT-Ontario's June conference will comprise invited and contributed papers pertaining to physics and
physics education, a film show, and displays by scientific supply firms and textbook publishers.
At the time of writing (late March), program details are not yet complete. Papers have been invited on
quarks (Nathan Isgur, University of Toronto), personal computers in physics education (Tim Ingoldsby,
Staff Physicist, AAPT), and the past, present, and future of physics education (panel discussion).
Abstracts for contributed papers have been received on undergraduate experiments, classroom demonstrations,
ideas for teaching specific topics, science projects, etc.
Registration fees for the conference will be approximately $8.00 for two days for AAPT-Ontario members,
$10.00 for non-members. If you plan to attend, it would be worthwhile to become a member - the cost is
only $1.00 for one year. Members receive the "AAPT-Ontario Newsletter" which contains details of
happenings concerning physics education in and around Ontario and tid-bits for physics teachers.
Accommodation will be provided in the residences at Trent University. The campus, located just north of
Peterborough on highway 28, is cut by the Otonabee River, and plans are being made for a barbeque by
the river on Friday evening, followed by a boat cruise. Peterborough lies in a very scenic part of
Ontario, right on the Trent Canal system, about 130 km north-east of Toronto; there are plenty of
opportunities for spending a pleasant Sunday after the conference.
For complete program details and further information, contact:
Ernie McFarland, President
AAPT-Ontario
Department of Physics
University of Guelph
GUELPH, Ontario NIG 2W1
(519-824-4120, ext. 3653 or 2261)
Tear Off
Name:
Institution:
Please reserve
Monday -
place(s) for the following events:
A day of shopping and lunch in Toronto Eaton Centre, Lunch and
afternoon in Yorkville/Hazelton Lanes area. Guide provided.
Lunch not included - $13.00 each
Tuesday morning
Tour and coffee at the historic Ancaster Mill. Lunch at
Hillside Racquets Club. Athletes over eleven may play tennis.
The rest can watch.
$11.50 each
Tuesday
evening
Bus trip to Niagara-on-the-Lake with supper.
Time to see the town.
"A Flea in Her Ear" and supper - $25.00 each
Later departure, supper not included - $17.50 each
Wednesday
11:00 a.m. - 3:00 - Tour of historic Dundurn Castle. Buffet lunch
on the castle grounds. Visit to the famous Rock Gardens.
$13.00 each
Wednesday evening
RETURN TO:
CAP Banquet with tour and cocktails at the Art Gallery
•
•
•
•
•
•
$14.00 each
CAP CONGRESS AT MCMASTER UNIVERSITY
(français au verso)
ix
-a*
^ ,.
y:
g '
T>
l u
v n
Jîil^r^
M
w
McMASTER UNIVERSITY CAMPUS
A = Senior Sciences Complex
B = Burke Science Building
a = entrance to Rms. 108
and B103
b = Auditorium
C = Commons Building and
Halls of Residence
D = Gilmour Hall (Post Office,
Bookstore and Travel Agency)
i
m
N
xi
SENIOR
SCIENCES BUILDING,
MCMASTER
CAP
Office
256
UNIVERSITY:
A
I
248
• down to Floor 1
249
EXHIBITS
(
270
271
j l M
FLOOR 2
274
^Registration
Information
Notice Board
. Employment Desk
To
Burke Science
^
Building
•down to Cafeteria and Exhibits
""HT
L ,1
165
T
EXHIBITS
164
163
L
162
Entrance
Exhibits
FLOOR 1
102
Entrance
KING STREET WEST
xii
CANADIAN ASSOCIATION OF PHYSICISTS MEDALLISTS 1980
LAUREATS DE L'ASSOCIATION CANADIENNE DES PHYSICIENS 1980
CAP Medal for Achievement in Physics
Bernard Margolis
Herzberg Medal
George I.A. Stegeman
CANADIAN ASSOCIATION OF PHYSICISTS PRIZE EXAM 1980
RESULTATS DE L'EXAMEN DE L'ASSOCIATION CANADIENNE DES PHYSICIENS 1980
Ninety-five students from twenty one universities competed this year. The exam was administered
by Paul Taras of Université de Montréal. The names of the first, second and third prize-winner
are shown followed by the next seven in alphabetical order.
John Sloan
Marc Tessier-Lavigne
James Warnold
FIRST PRIZE
SECOND PRIZE
THIRD PRIZE
Peter Celliers
Robert Ewan
Mark Freeman
Kevin Hood
Brian A. Judd
Ken Ragan
David Singh
Queen's University
McGill University
Université d'Ottawa
Queen's University
Queen's University
University of Alberta
Queen's University
Queen's University
University of Alberta
Université d'Ottawa
FUTURE CONGRESSES
CONGRES FUTURS
1981 - Dalhousie University, Halifax, June 15 - 18
1982 - Queen's University and Royal Military College, Kingston, June 21 - 26
1983 - University of Victoria, Victoria, June 27 - 30
CONGRES ACP 1980 CAP CONGRESS
LIST OF EXHIBITORS/LISTE DES EXPOSANTS
Manufacturers and Suppliers/Manufacturiers et Représentants
ATOMIC ENERGY OF CANADA
DURHAM INSTRUMENTS
EDWARDS HIGH VACUUM
FLOATING POINT SYSTEMS (CANADA) LTD.
GUILDLINE INSTRUMENTS LTD.
LABSERCO LIMITED
LUCTOR CANADA LTD.
MERLAN SCIENTIFIC LTD.
OPTIKON CORPORATION LTD.
PEABODY SCIENTIFIC
RADIONICS LTD.
TASMAN SCIENTIFIC
VARIAN CANADA, INC.
EG & G INSTRUMENTS
PERKIN-ELMER
xiii
xiv
LISTENERS,
SPEAKERS,
SPECIAL
INSTRUCTIONS
A N D SESSION
FOR TIMED
CHAIRMEN
PAPERS
The papers will be timed in order to make it possible for listeners to transfer from one session
to another.
LISTENERS
1)
Please arrive at a lecture room promptly before the next paper is to begin.
2)
Leave a session unobtrusively, preferably either during or at the end of the question and
answer period.
SPEAKERS
1)
Make your slide projection arrangements before the start of your session.
2)
Be ready to start your talk on time.
3)
Pace your talk to end well before the next talk begins:
paper and about 10 minutes for an invited paper.
4)
Answer questions and perhaps comments as completely and briefly as made necessary by the
response of the audience.
5)
Obey your chairman's instructions.
6)
Most important, practise giving your talk BEFORE the meeting. Remember, you are the
ambassador of your department and institution, and you will be judged by your audience.
about 3 minutes for a contributed
CHAIRMEN
1)
Get to the session room about half an hour before your session begins. Check that all needed
projection and auxiliary equipment are present and operational. Check that your speakers
are present.
2)
Start each paper right on time.
3)
Make sure each speaker stops talking well before the next paper begins.
4)
Keep the question periods interesting, lively and productive. Read over the papers in your
session beforehand. If necessary, prepare comments and questions.
5)
Do not let any discussion period get out of hand, either on the speaker's or the questioners'
side.
6)
If no one appears to give a paper, then either close the session until the time of the next
scheduled speaker or else use the time imaginatively, perhaps begin a discussion of earlier
papers.
7)
Under no circumstances may the order of giving the papers differ from that given in the
program, even though you may, in your wisdom, see a better arrangement than that determined
by the Program Committee.
INVITED SPEAKERS/CONFERENCIERS INVITES
AHLBORN, B., UnlveAilty 0f BAltÀih Columbia.; CB1: Axial Confinement of Linear Magnetic Fusion Devices
ALCOCK, A.J., Natlcnal ReieaAch Council of Canada; EB3: Inertial Confinement Research in Canada
ANDRÉ, H., M. P., CalgaAy CentAe; BH1: R & D Costs - A Public or Private Responsibility
ANDREWS, H.R., Chalk RlveA NucleaA LaboiatoAiei; DEI: Progress in Accelerator-based Radioisotope Dating
ARROTT, A., Simon FlOieA UnlveAilty; DAI: Phenomenology of Dynamic Effects on the Magnetic Response near Tc
AXEN, D., TRIUMF; DDI: Nucleon-Nucleon Elastic Scattering from 200 to 500 MeV
AZUMA, R.E., UnlveAilty of Tolonto; AE4: Solar Neutrino Problem
BARBER, H.D., Linear Technology Inc..; AA2: University/Industry Interaction: A Case Study
BARRIE, R. UnlveAilty of SAitlih Columbia; EA1: Optical Properties of Impurities in Semiconductors
BEDERSON, B., Ne» Volk UnlveAilty; EC1: Electron Scattering by Highly Polar Systems
BÉLANGER, P.A., UnlveAilté Laval; CFl: Optical Phase Conjugation
BROWN, T.S., Wational toWlch CounclZ 0(Ç Canada; EB1: Status and Prospects of the Canadian Fusion Program
CARBOTTE, J.P., McMaiteA UnlveAilty; GA4: Superconductivity in the A15 Compounds
CARETTE, J.D., UnlveAilty Laval; EC4: Electron Scattering by Adatoms and Admolecules
CHODOS, A., Vale UnlveAilty; EE2: Conserved Quantities in Two & Four Dimensions
CLARKE, T.E., Innovation Management Inititute of, Canada; BA3: Beyond the Laboratory Door
COLERIDGE, P.T., National ReieaAch Council of Canada; EA3: Electronic Structure of Dilute Alloys - Evidence from the
de Haas-van Alphen Effect
CORKUM, P.B., National ReieaAch Council of Canada; BD1: Injection Mode Locking
CRADDOCK, M.K., UnlveAilty of BAitlih Columbia; CCI: "CANUCK" Kaon Factory: Physics Potential and Machine Design
CRAWFORD, A.R., Anatek ElectAonlci Ltd.; BH3: National Initiatives for Increased Research and Development Their Impact on Small High Technology Companies
CRONIN, J.W., UnlveAilty of Chicago; BEI: CP Violation
CURRIE, J.F., Ecole Polytechnique; AGI: Coherent, Cooperative Phenomena in Nonlinear Physical Systems and Solitons
DATARS, W.R., McMaiteA UnlveAilty; EA4: Charge Density Waves in Potassium
DEP0MMIER, P.H., UnlveAilté de MontAéal; CC4: The Montreal Electron Project
DRAKE, G.W.F., UnlveAilty of WlndiOA; DB1: Recent Progress in Lamb Shift Measurements - Theory and Experiment
FRANK, J.P., UnlveAilty of Alberuta S UnlveAilty 0(5 Velauxvte; BB1 : Equilibrium Data and Kinetics of the Transition between
the Close-Packed Phases of Solid "*He
FUJII, Y., BAOokhaven National LaboKatoAy; AB4: Inelastic X-Ray Scattering Measurements with Synchrotron Radiation
GELDART, D.J.W., Valhouile UnlveAilty; DA2: Critical Behaviour of Magnetic Materials from Electronic Transport Properties
GREGORY, B.C., INRS-EneAgle; EB2: Magnetic Confinement Research in Canada
HARRIS, R., McGWL UnlveAilty; EA2: Metallic Glasses: New Playground for the Low Temperature Physicist
HARVEY, M., Atomic EneAgy of Canada Ltd.; EE3: Effective Nuclear Forces in the Quark Model with Delta and Hidden-Colour
Channel Coupling
HEMINGWAY, R. J., The Institute 0f PaAtlcle Phyila; CC2: The e-p Collider
IRWIN, J.C., Simon FAaieA UnlveAilXy; AB1: Raman Scattering from Intercalated Layer Compounds
ISGUR, N., UnlveAilty of, Toronto; ADl: What is Isospin?
JANDL, S., UnlveAiltC de SheAbAooke; AB2: Scattering Processes in the Layered Compounds
JOHNSON, D.C., VepaAtment of Communications; CF2: Fiber Optics at the Communications Research Centre
KAHANA, S., SAOOkhaven National Labonatony; EE4: Molecular-like Phenomena in Heavy Ion Reactions
KARL, G., UnlveAilty 0(5 Guelph; DB3: Parity Violation in Atoms and Molecules
KAVANAGH, R.J., UnlveAilty of Neu) BAuniullck; AA1 : The New NSERC Research Manpower Programs
KINSNER, W., The TnduitAlal Applications of MlcAoelectAonlci CenteA; BA2: The Industrial Applications of Microelectronics
Center
LEE, J.K.P., UcGltt UnlveAilty; BF1: Evolution of the McGill 0n-Line Mass Spectrometer
LEE, P.A., BeZl Telephone LaboAatoAiei; GA2: Localization and Interactions in Two Dimensions
MAK, H.-B., Queen'i UnlveAilty; EDI: Life Below the Coulomb Barrier: 1 8 F and 2 0 Ne
MARK0, A.M., Chalk RlveA NucleaA LaboAatoAiei; FA3: Health Effects of Nuclear Power
MAY, A.D., UnlveAilty 0|5 Tolonto; DB4: A Laser Test of Parity Violation in Atoms
McCONKEY, J.W. , UnlveAilty 0(5 WlndiO*i; EC2: Optical Polarization and Polarization-Correlation Studies following Electron
Impact Excitation
McDIARMID, I.B., National ReieaAch Council 0f Canada; CD1: Some New Developments in Space Science in Canada
McEWAN, D.J., UnlveAilty o( Saskatchewan; CD2: A Campaign to Study Pulsating Auroras
MEADE, D., PAinceton UnlveAilty; BC1: Impurity Control in Tokamaks Using Divertors
MORE, R., UnlveAilty 0( WeiteAn OntaAlo; BA5: Getting High Technology Products to Market
MUSTARD, J.F., EacnJbty ofa Health Sclencei; BH2: The Relationship between University Research
and Development and the Socio-economic Stability of Canada
0RMR0D, J., Atomic EneAgy of, Canada Ltd.; CC3: The Chalk River Superconducting Heavy-Ion Cyclotron
PEPIN, H., JNRS-EneAgle, UnlveAilty du Québec; ACl: Experiments on the Interaction of the CO2 laser light with Matter at
INRS-Energie: Non-linear Coupling of Laser Radiation and Energy Transport
PINK, D. , St. Enancli XavleA UnlveAilty; GA1: Theoretical Models of Biological Membranes
P0C0BELLI, G., UnlveAilty 0(5 Saskatchewan; DC1: Classical Electron Motion in a Wave of Slowly Varying Amplitude and Damping
of a Plasma Wave with Detrapping of the Electrons
RAMSEY, N.F., HaAvaAd UnlveAilty; DB2: Experiments on Time Reversal Symmetry and Parity
REINES, F., UnlveAilty Of, California; AD2: Is the Proton Stable?
ROBERTSON, J.A.L., Chalk ZiveA NucleaA LaboiatoAieA; FA2: Nuclear Energy: Trans-Science is not Enough
ROBINSON, J.E., McMaiteA UnlveAilty; EB4: Fusion-related Materials Research in Canada
R0LFE, J., National ReieaAch Council of Canada; BG1: Coupled Defects in Ionic Crystals
SHEPHERD, J., Leigh JnitAumenti Ltd.; AA3: Clearing the Hurdles and the Problems of University/Industry Interaction
SHEPPARD, D.M., UnlveAilty of AlbeAta; CC5: MARIA — Medical Accelerator Research Institute of Alberta
SIMPSON, J.J., UnlveAilty of Guelph; AD3: Measurement of the 6-energy Spectrum of 3 H for Determining the Anti-neutrino Mass
SINCLAIR, G., SlnclalA Radio LaboAatoAiei Ll/tuXzd; BA1: Why Innovation is Virtually Impossible In Canada
SOUTHERN, B., UnlveAilty of Manitoba; GA3: Spin Glasses
STEVENS, E.D., State UnlveAilty of New VoAk; AB3: Determination of Electron Density Distributions in Solids by x-Ray and
Neutron Diffraction
SUTHERLAND, P., McMaiteA UnlveAilty; EE1: Implications of the Hot Big Bang for Particle Physics
SVENSS0N, E.C., Atomic EneAgy of Canada Limited; DA3: Excitations of Small Isolated Clusters of Magnetic Ions
TARAS, P., UnlveAilty de MontH&al; AEl: Yrast Traps at High Spin
TRISCHUK, J., McGill UnlveAilty; BE2: A Measurement of the Lifetimes of Charmed Particles
V0GT, E.W., Science Council of BAitlih Columbia; AA4: The Science Support System in B.C.
WADDINGT0N, J.C., McMaAteA UnlveAilty; EC1: Quasiparticle Angular Momentum Alignment in Rotating Nuclei
WEBSTER, D.C., Helix Inveitmenti; BA4: A Venture Capitalist's View of Entrepreneurs
WEINBERG, A.M., Initltute foi EneAgy Analyili; FA1: The Future of Nuclear Energy
WEINGARTSHOFER, A., St. pAandi XavleA UnlveAilty; EC3: Electron Scattering in Intense Laser Fields
WHALEN, B.A., National ReieaAch Council of Canada; CD3: Current Trends in Space Plasma Research
WOODS, D.R., McMaiteA UnlveAilty; CEI: Problem Solving Techniques in Physics
xv i
PROGRAM SUMMARY
RESUME DU PROGRAMME
The letter code of the session, the starting time, the location and the topics of each session are given in order.
Sessions will be held in either the Senior Sciences Building (SS) or the Burke Science Building (BS) unless otherwise
indicated.
(The personal names are those of invited speakers).
SUNDAY, June 15
19:30
CAP COUNCIL - Brandon Hall, Room 112
MONDAY, June 16
AA
AB
AC
AD
AE
AF
AG
9:00
9:00
9:00
9:00
9:00
9:00
9:00
SS 163
SS 102
SS 164
BS 108
BS B103
SS 165
SS 271
Industrial and Applied Physics Is KAVANAGH, BARBER, SHEPHERD, VOGT
Spectroscopy: IRWIN, JANDL, STEVENS, FUJII
Laser Produced Plasmas: PEPIN
Particle Physics Is ISGUR, REINES, SIMPSON
Nuclear Physics A: TARAS, AZUMA
Molecular Physics
Phase Transitions: CURRIE
BA
BB
BC
BD
BE
BF
BG
13:30
13:30
13:30
13:30
13:30
13:30
13:30
SS 163
BS 108
SS 164
SS 271
SS 165
SS 270
BS B103
Industrial and Applied Physics II: SINCLAIR, KINSNER, CLARKE, WEBSTER, MORE
Low Temperature: FRANCK
Magnetic Confinement of Plasmas: MEADE
Optical Physics Is CORKUM
Particle Physics Ils CRONIN, TRISCHUK
Nuclear Techniques and Reactor Physics: LEE
Optical Properties: ROLFE
16:15
16:15
16:00
16:00
BS B10 3
BS 108
SS 271
SS 165
Division
Division
Division
Division
20:00
Burke
Auditorium
Achieving the Goal for R 4 D: ANDRE, MUSTARD, CRAWFORD
BH
of
of
of
of
Atomic 4 Molecular Physics
Condensed Matter Physics
Optical Physics
Particle Physics
TUESDAY, June 17
SS 163
BS 108
BS B103
SS 102
SS 270
SS 271
SS 164
SS 165
Metals
Linear Plasma Confinement, Shocks and Diagnostics: Fundamental Processes in Plasmas: AHLBORN
Accelerator Projects in Canada: CRADDOCK, HEMINGWAY, ORMROD, DEPOMMIER, SHEPPARD
Aeronomy and Space Physics: MCDIARMID, MCEWEN, WHALEN
Physics Education: WOODS
Optical Physics lis Laser Optics, Guided Wave Optics, Holography: BELANGER, JOHNSON
Condensed Matter Theory
Structures
13:30
13:30
13:30
13:30
13:30
13:30
SS
SS
SS
SS
SS
SS
Magnetism: ARROTT, GELDART, SVENSSON
Atomic 4 Molecular Physics Symposium: DRAKE, RAMSEY, KARL, MAY
Waves and Instabilities In Plasmas: P0C0BELLI
Nuclear Physics B: AXEN
Applied Nuclear Science: ANDREWS
Films and Intercalation
16:00
16:15
16:15
16:00
16:00
BS 108
SS 165
SS 270
SS 164
BS B103
CA
CB
CC
CD
CE
CF
CG
CH
9:00
9:00
9:00
9:00
9:00
9:00
9:00
9:00
DA
DB
DC
DD
DE
DF
102
163
164
165
271
270
Division
Division
Division
Division
Division
of
of
of
of
of
Aeronomy 4 Space Physics
Nuclear Physics
Physics Education
Plasma Physics
Theoretical Physics
WEDNESDAY, June 18
EA
EB
9:00
9:00
SS
BS
102
108
EC
9:00
SS
163
ED
EE
EF
EG
9:00
9:00
9:00
9:00
SS 165
BS B103
SS 271
SS 164
FA
13:30
FB
15:45
Burke
Science
Auditorium
Metals: BARRIE, HARRIS, COLERIDGE, DATARS
Symposium on Thermonuclear Fusion in Canada: Progress and Prospects: BROWN, GREGORY, ALCOCK,
ROBINSON
Symposium on Electron Scattering, Dedicated to the Memory of E.M. Clarke: BEDERSON, MCCONKEY,
WEINGARTSHOFER, CARETTE
Nuclear Physics C: H.-B. MAK
Particle and Nuclear Theory: SUTHERLAND, CHODOS, HARVEY, KAHANA
Excitations
High Spin States: WADDINGTON
Plenary Session - The Future of Nuclear Energy: WEINBERG, ROBERTSON, MARKO
Presidential Address and CAP Annual General Meeting
THURSDAY, June 19
GA
GB
GC
GD
9:00
9:00
9:00
9:00
12:00
SS
SS
SS
SS
102
164
163
165
Condensed Matter Theory: PINK, LEE, SOUTHERN, CARBOTTE
Atomic Physics
Semiconductors
Nuclear 4 Particle Physics Workshop on the Study of Future Research Opportunities in Physics
CAP Council
SUNDAY, JUNE 15, 1980
BRANDON HALL, ROOM 112
19:30
CAP COUNCIL
Chairman: P.A. Forsyth
MONDAY, JUNE 16, 1980
ROOM SS 163
Chairman: D. Smeaton
9:00
AA1
INDUSTRIAL AND APPLIED PHYSICS I
The New NSERC Research Manpower Programs
R.J. Kavanagh, Acting Vicz-VieAldtut (Academ-tc), UrUveAJi^ti/ of Nw BAiuiSMick
Following its review of the Five-Year Plan submitted by the Natural Sciences and F.ngineering
Research Council, the federal government increased the Council's budget bv 3e* million dollars
for the first year of the Plan, i.e. for 1980-81. This budget increase will suDport, among
other programs, new initiatives aimed at encouraging the training of highlv skilled manpower
for the support of research and development in both universities and industry. This paper will
set forth the objectives of NSERC's new manpower programs and, in particular, will describe the
development of the new Research Fellowships and Undergraduate Summer Research Awards programs.
9:45
AA2
University/Industry Interaction:
A Case Study
H.D. Barber, Vle.e.-P>i&i-idint of OpeAatioru,, LLmoa. TzchnoZagy Inc.
L i n e a r T e c h n o l o g y I n c i s a h i g h t e c h n o l o g y i n t e g r a t e d c i r c u i t i n d u s t r y , v e r y d e p e n d e n t on h i g h l e v e l s
o f s c i e n t i f i c and e n g i n e e r i n g i n p u t .
LTI i s a " s p i n o f f " f r o m a l a r g e company.
The h i s t o r y in t h a t
company and t h e s u b s e q u e n t h i s t o r y a s an i n d e p e n d e n t company c o v e r s f i f t e e n y e a r s .
In a l l t h o s e y e a r s ,
b e c a u s e of t h e s m a l l s i z e o f t h e s c i e n t i f i c g r o u p and t h e h i g h l e v e l s o f s c i e n t i f i c and t e c h n i c a l
k n o w l e d g e n e e d e d , t h e s c i e n t i f i c g r o u p h a s s o u g h t t o e n c o u r a g e and e x p l o i t e v e r y p o s s i b l e a v e n u e o f
i n t e r a c t i o n w i t h the u n i v e r s i t y s c i e n t i f i c community.
This paper w i l l d e s c r i b e the types of i n t e r a c t i o n t h a t w e r e t r i e d , t h e f a c t o r s w h i c h h a v e a f f e c t e d s u c c e s s and f a i l u r e and t h e c h a n g i n g n a t u r e o f
that i n t e r a c t i o n over time.
The c o n c l u s i o n i s t h a t , a t l e a s t in t h i s c a s e , t h e i n t e r a c t i o n h a s had
important positive e f f e c t s .
Some c o n c l u s i o n s w i l l be drawn a b o u t ways in w h i c h s u c h i n t e r a c t i o n c o u l d
be i m p r o v e d .
10:30
Break
10:45
AA3
11:30
AA4
Clearing the Hurdles and the Problem of University/Industry
J. Shepherd, ChaJjman, LeÂgh InAtrumwtl, Ltd.
Interaction
The Science Support System in B.C.
E. Vogt, ChaMiman, Science CouncÀZ of B^UtUh Columbia
During the last two years the Province of British Columbia has developed an extensive system of
institutions for the support of research in science and technology. The important elements of this
system are: (a) a provincial Ministry of Science and Technology; (b) a Discovery Foundation composed
of industrial and university leaders with a wide mandate for promoting science; (c) a system of
discovery parks; (d) a Science Council charged not only with providing advice on science policy but
also with a substantial budget for grants in applied research and for graduate and postdoctoral
fellowships;
(e) growth in the long-established laboratories of B.C. Research. The operation of
this system and some of its goals will be described.
2
MONDAY, JUNE 16, 1980
ROOM SS 102
Chairman: E.C. Svensson
9:00
AB1
SPECTROSCOPY
Raman Scattering from Intercalated Layer Compounds
J.C. Irwin, Simon FixueA UrUveAAiXy
9:45
AB2
Scattering Processes in the Layered Compounds
S. Jandl,
UniveAi-iXi dt Shtlbiookt
In this talk, experimental results of infrared measurements as well as neutron and Raman scattering in
some two-dimensional layered compounds (TiSe», NbSe„, SnSe^, GaS, InSe etc...) will be presented. The
models used to fit the phonon frequencies will be discussed mainly in relation with the two dimensional
character of these structures. Some aspects of the e - lattice interaction through the charge density
waves transition will also be discussed.
10:30
Break
10:45
AB3
Determination of Electron Density Distributions in Solids by x-Ray and Neutron Diffraction
E.D. Stevens, StaXz UniveMity o( New Voik
Careful measurements of x-ray d i f f r a c t i o n i n t e n s i t i e s , often combined with neutron d i f f r a c t i o n
r e s u l t s , allow detailed experimental mapping of the electron density d i s t r i b u t i o n in a s o l i d .
In the past decade, improvements i n experimental design, corrections f o r systematic e r r o r s , and
methods of analysis have s i g n i f i c a n t l y increased the resolution and accuracy of experimental charge
d i s t r i b u t i o n s . For example, f o r molecular s o l i d s , experimental densities have been obtained in
good q u a n t i t a t i v e agreement with densities calculated from theoretical wavefunctions of near
Hartree-Fock q u a l i t y . 1 Although most studies have been of molecular solids containing only l i g h t
elements, recent applications of the method have involved structures containing f i r s t row t r a n s i t i o n elements, as well as minerals, ionic s o l i d s , and l i g h t metals and metal a l l o y s . Iri iron pyr i t e (FeSî), a large asymmetry observed in the electron density around the metal atom is c l e a r l y
related to the p r e f e r e n t i a l occupancy of the lower energy d - o r b i t a l s in a strong crystal f i e l d .
F i t t i n g the density with multipolar deformation functions y i e l d s , w i t h i n the crystal f i e l d approximation, populations of the atomic d - o r b i t a l s . Recent results of charge density determinations
and prospects f o r future studies on solids containing heavier elements w i l l be discussed.
1.
2.
11:30
AB4
E. D. Stevens, J. Rys, & P. Coppens (1978), J. Am. Chem. Soc. 100, 2324; E. D. Stevens & P.
Coppens (1980), Acta Cryst. in press.
E. D. Stevens & P. Coppens (1979), Acta Cryst. A35, 536; E. D. Stevens, M. L. DeLucia, & P.
Coppens (1980), Inorg. Chem. in press.
Inelastic X-Ray Scattering Measurements with Synchrotron Radiation
Y. Fujii, Blook.ha.vm National La.bofuU.olij *
Inelastic x-ray scattering techniques capable of resolving the energy transfer AE » 1 ^ 10 meV of
photons with the incident energy E • 5 ^ 1 5 keV have been desired for studying unexplored field
of collective excitations, as from surface areas and low-dimensional crystals, over the energy
range 1 meV < to < 1 eV in a wide momentum space. The full use of the intense and highlycollimated synchrotron radiation incorporated with the special perfect-crystal monochromator and
analyzer assemblies makes it feasible to achieve such an ultra-high resolution AE/E = 10 - 6 'vl0" 7 ,
being about two orders of magnitude higher than that obtainable by the current technique. The
capabilities of a spectrometer currently designed for that purpose will be presented from
technical and scientific points of view.
•Supported in part by DOE contract DE-AC02-76CH00016.
MONDAY, JUNE 15, 1980
ROOM SS 164
Chairman: A.A. Offenberger
9:00
AC1
LASER PRODUCED PLASMAS
Experiments on the Interaction of the CO2 Laser Light with Matter at INRS-Energie:
Non-linear Coupling of Laser Radiation and Energy Transport
Henri Pepin, I N R S EneAgie., UvUv&teM da Québec
9:45
AC2 Scaling Laws for Simple Shell Targets. B. AHLBORN,
University of British Columbia and M.H. KEY, Rutherford
Laboratory - Spherical shell targets with homogenious
walls of width AR and radius R and density p p are considered which are filled with DT gas of density p^.
These targets may be operated as explosive or ablative
pushers when exposed to laser pulses of energy E (joule)
intensity I (watt/cm2) and wavelength A (ym) . Scaling
laws are derived to determine the maximum density pp,
the maximum line density ppRp, and the maximum temperature Tp. For the explosive pusher mode we assume instantaneous absorption of the fraction n e x of the laser
energy in a thin shell, and for the ablative mode we
assume continuous absorption of the fraction ri of the
constant laser power I in a thick shell, and find
P F = 2.2 p | / 5 p ^ / 5 A i ;
pfRf
= 1.7 p | / 5 p 2 / 5 R A
2
and
Tp(eV)
2
A
= P Ir /s
' A3,
where for the explosive mode A^, nAj = 1, A ,
= 8.4,10 _ 6 n e x (E/M) and for the ablative mode
= (R/AR)
10:30
AC5
Dependence of Laser-Enhanced Semiconductor
Reflectivity on Excitation Wavelength.* P.C. FEIN and
H. M. VAN DRIEL, Dept. of Physics, University of
Toronto - The optical reflectivity of. germanium for
infrared wavelengths is greatly enhanced when illuminated by high-intensity laser radiation absorbed near
the surface. This is associated with the formation of
a high-density reflecting plasma.1 We have studied
the reflectivity at near normal incidence of 10.6 um
radiation from germanium when Illuminated by 1.06 um
and 0.53 um laser radiation. It is found that the
minimum reflectivity associated with the plasma dip is
much higher for the 0.53 um case. This is interpreted
in terms of the plasma collision frequency and the
thickness of the reflectivity layers in the two cases.
^lcock, A.J. and Corkum, P.B., Can. J. Phvs., 57, 1280
(1979).
Research supported by N.S.E.R.C.
3 5
/ , A 2 = (R/AR) 2/5 and A3 = 1.94 ,10 _1 % 8 / 9 I 7 / 9 ( R / A R )
2/5 . -3/5 ,,-2/9
10:00
AC3
Energy Partition on C02 Laser Irradiated
Microballoons. G.D. ENRIGHT, M.D.J. BURGESS,
R. FEDOSEJEVS, M.C. RICHARDSON, and D.M. VILLENEUVE,
N.R.C. Canada - In high intensity laser fusion experiments where the interaction is dominated by collisionless processes it is of primary importance to determine
the efficiency with which the absorbed energy is cxxpled
into the high density thermal plasma. In the present
experiments glass microballoons are irradiated by a
single intense (>101,4 W a n - 2 ) nanosecond 002 laser pulse
and the energy partition between the thermal and superthermal components is determined using plasma calorimetry, interferonetry and fast ion spectrometry. The
results indicate that although "25% of the incident
laser energy is absorbed only a small part can be
accounted for in the thermal plasma distribution deduced
from time resolved interfercnetry. This implies that
the bulk of the absorbed energy (>80%) is deposited into
the superthermal plasma blcwoff.
10:45
AC6
Corrélation temporelle des signaux rétrodiffusés à 10.6 ym et émis à 5.3 ym par une cible solide illuminée par un laser C O 2 à impulsions lisses
de longue durée et de grande puissance. J.L. LACHAMBRE et R. NEUFELD Direction Production et Conservation
de l'énergie, IREQ, Varennes, pué., Canada JOL 2P0. Nous présentons les résultats de mesures spectvoscopiques de rëtrodiffusion et de gé.nëration d'harmoniques
sur une cible solide irradiée par une impulsion laser
lisse. Produite par un tandem oscillateur-amplificateur
au gaz carbonique, cette impulsion fait 25 ns en durée
et 2 GW en puissance. Les intensités des signaux à
tx1 et 2co ainsi que leur dépendance sur l'intensité
incidente y sont étudiées. La forme temporelle de ces
signaux est caractérisée par une série de pics non
périodiques d'amplitude et de durée aléatoires. Les
formes temporelles et les spectres respectifs sont
comparés en mettant en évidence une corrélation positive entre les formes temporelles de la rétrodiffusion
à 10.6 ym et l'émission à 5.3 ym.
10:15
AC4
Studies of the Superthermal Corona Produced by
Intense C02 Laser Radiation on Limited Mass Targets.
M.C. RICHARDSON, M.D.J. BURGESS, G.D. ENRIGHT,
P.A. JAANIMAGI, R.S. MARIORIBANKS and D.M. VILLENEUVE,
N.R.C. Canada - It is well-known that in intense nanosecond 002 laser interaction with solid targets,
absorption occurs primarily through processes which
generate collisionless superthermal electrons. The
transport of energy through these electrons, and the
fast ion ocnponent to which they give rise, is of much
interest to current laser fusion investigations. A
nunber of experimental investigations of the fast ion
emission, x-ray and visible radiation frcm microtargets
of various geometries have been made to more clearly
define the propagation of the superthermal coronal
sheath. It is found that the large fraction of the
absorbed energy resident in the latter can be transported to regions of the target well removed frcm the
interaction zone. The consequences of these studies for
laser fusion with 10pm radiation will be discussed.
11:00
AC/
L'expansion du plasma produit par l'interaction d'une impulsion laser CO? de longue durée avec
une cible solide. C.R. NEUFELD et J.L. LACHAMBRE
Direction Production et Conservation de l'énergie,
IREQ, Varennes, Qué • , Canada JOL 2P0. - Nous avons
irradié des cibles massives d'aluminium avec des impulsions de forme lisse et de longue durée ( - 25ns)
produites par un laser TEA-CO2. La puissance crête
des impulsions atteignait une valeur maximale de
2GW, ce qui correspondait à un flux laser à la surface
de la cible de 2 x 1012 Wcm - ^. Des collecteurs de
charge placés près de la cible ont fourni des mesures
du courant ionique du plasma éjecté de la cible.
L'interprétation de ces mesures en termes de spectres
de vitesse indique que le comportement de la grande
majorité des ions est bien décrit par un modèle
d'expansion isothermique. Nous discuterons de quelques
implications d'un tel résultat.
4
11:15
AC8
Anomalous Absorption of C0 ? Laser Radiation In
High Density Gas Target. A.A. OFFENBERGER, A. NG and
S. KARTTUNEN*, Department of Electrical Engineering,
University of Alberta - Efficient absorption
100%)
of long-pulse CO2 laser radiation by an oxygen gas
target is experimentally observed following a transient
phase of stimulated Brillouin scattering (SBS). The
combined specular and SBS reflection is found to peak
at ^ 30% for an incident intensity of 5xl0 1 2 watt/cm 2 ,
corresponding to v 2 / v 2 » 1,and decrease thereafter.
In overall energy gallnee, however, reflection losses
are less important. Inverse bremsstrahlung is inadequate
to account for the high absorption in the critical
density plasma with scale length of ^ 100pm. In
addition, strong flux inhibition is inferred from ion
velocity measurements. Ion turbulence is postulated to
account for the observed absorption and flux inhibition.
Mechanisms for generating the required 10% ion
fluctuation levels will be discussed.
* Permanent address: Technical Research Centre of
Finland, Helsinki.
11:30
AC9
Ion Emission Measurements from C0 2 Laser Produced
Plasma. P. Church, F. Martin, H. Pépin, T.W. Johnston,
IHRS-Energle, Université du Québec, C.P. 1020, Varennes,
Québec J0L 2P0, R. Decoste, Institut de Recherche d'HvdroQuébec Varennes, Qué. J0L 2P0. - Ion velocity spectrum
are obtained from charge collector data of a CO2 laser pro
duced plasma. Using the isothermal expansion model, scaling of the hot electron temperature T with incident laser flux cjL is obtained for values of I x 10 1 2 W/cm 2 to
2 x 1 0 1 3 W7cm 2 . The model also predicts v,,^ a c s where
v
max -t-3
velocity of the leading edge (fastest ions)
and c s is the ion sound speed. Since c g a
measurements of VJ^JÇ at several fluxes provide an indirect measurement of .the scaling of T H with
. Both methods are in
agreement and show a transition in the scaling law T j j ~<t>^ n
12
at a critical flux i(icr = 6 x 1 0
W/cm 2 . This result is
consistent with others obtained from X-ray measurements.
The behavior of Tjj for
> i)>co agrees with previous computer simulation "(1) which suggests the resonance absorption mechanism as being dominant.
1
D.W. Forslund, J.M. Kindel, K. Lee, Phvs. Rev. Lett.
39 (5), 284 (1977).
11:45
AC10
Angular Dependence of Stimulated Brillouin Amplification in Drifting Plasmas. T.W. JOHNSTON, G.
MITCHEL, B. GREK, F. MARTIN, H. PEIPIN, INRS-Energle,
Université du Québec, C.P. 1020, Varennes, Québec,
J0L 2P0 - Concepts evolved by A. Bers and co-workers1
for parametric amplification including anisotropy have
been applied to stimulated Brillouin amplification in
drifting plasmas (such as the coronal region of plasmas
created by laser interaction on targets ). Cases of
interest for laser-plasma interaction are examined in
some detail, including the effects of such parameters
as angle of incidence (relative to drift direction),
scattering angle, drift speed (relative to sound speed),
ion temperature (relative to electron temperature).
1
e.g. A. Reiman, Phys. Fluids 21 (6) 1000 (1978).
12:00
ACll
Scattering of Incident Radiation from CO2 Laser
Produced Plasmas.
G. Mltchel, P. Church, B. Grek, T.W.
Johnston, H, Pépin, F. Martin, INRS-Energie , U. du Québec, C.P. 1020, Varennes, J0L 2P0 - Detailed experimental studies of light backscattered from CO2 laser-produ•"ed plasma will be discussed. These results indicate
that in the general case of wide-aperture focussing optics and/or off-axis incidence the reflected light collected by the focussing optics is neither a ray-retrace
nor phase conjugate of the incident beam. Rather, the
scattering includes an angular dispersion and complicated phase and intensity perturbations. These results
will be discussed in terms of Brillouin scatter from a
plasma flowing at angles other than antiparallel to the
incident laser and at speeds close to sonic.
12:15
AC12
Space Resolved Continuum X-ray Emission from
Hot Electron Transport in CO7 Laser Plasmas. R. DECOSTE,
Institut de Recherche de 1'Hydro-Québec, Varennes.
J.C. KIEFFER, II. PEPIN, F. MARTIN, T.W. JOHNSTON, INRSEnergie, Université du Québec, Varennes, J0L 2P0 - Depth
of heat transport into a layered target by both thermal
and suprathermal electrons are reported for a range of
target irradiances. At higher irradiances (>6 x 1 0 1 2
W/cra ) the thermal electron penetration decreased sharply while the suprathermal electron penetration increased. Lateral transport much beyond the laser spot diameter is also observed from space resolved continuum
X-ray emission using CH steps of various thickness deposited on a glass substrate.
MONDAY, JUNE 16, 1980
ROOM BS 108
Chairman: D.F. Measday
9:00
AD1
PARTICLE PHYSICS I
What is Isospin?
N. Isgur, UrUveA.6-iXy of Tofwnto
Isospin violations are usually assumed to be small effects of electromagnetic origin, so that, for
example, M « M^ and
« Mff if a « 0, This view, at the quark level, demands a degeneracy of the
up and dowS quark masses whicS seems very odd in view of the known spectrum of fermion masses. I will
discuss the possibility that like SU(3) , SU(2) is an approximate,as ppposed to fundamental.symmetry
that is badly broken by the ("current") quark masses; the "goodness" of the symmetry results because
the s y m m e t r y breaking effects are usually masked. This new perspective on Isospin leads not only to
a better understanding of some standard isospin violations, but also to the prediction that very large
isospin violations can be observed in special circumstances.
9:45
AD2
10:30
10:45
AD3
Is the Proton Stable?
F. Reines, UniveAiiXy of CatifosuUa
Break
Measurement of the 8-Energy Spectrum of
J.J. Simpson, UrU.vzM>ity of GueZph
3
H for Determining the Anti-neutrino Mass
A novel method has been developed for measuring the B-ray energy spectrum of tritium for the purpose of
determining the mass m^ of the electron anti-neutrino. Basically the method involves implanting 3 H
accelerated by a tandem Van de Graaff accelerator deep into a Si(Li) X-ray detector, thereby producing
a source-detector combination of 100% efficiency and reasonable resolution. A description of the first
experiment carried out, giving an upper limit on m^ comparable to the previous best, will be presented.
There will also be discussion on how the limit can be lowered in the present type of experiment, and on
the 3 H- 3 He atomic mass difference which is inferred from the measured end-point energy of the 8-spectrum.
11:30
AD4
Atomic Capture Ratio in Oxides using the Lifetime Method. T. Suzuki, D.G. Fleming, D. Garner,
D.F. Measday, R. Mikula. University of British Columbia. The
lifetime has been measured in 50 elements
including 8 isotopes. The system was checked against
+
the y lifetime which was found to be 2197.1 ± 0.7 n.sec
in good agreement with the accepted value of 2197.13 ±
0.08 n.sec.I The p" beam was also stopped in 23 oxides
in order to measure the atomic capture ratios. The
number of muons captured by each element was identified
from an analysis of the decay curve. The capture
ratios are in fair agreement with earlier X-ray measurements . ^
Review of Particle Properties.
Phys. Lett. 25B, 1 (1978).
C. Bricman et al.
H. Schneuwly et al., Nucl. Phys. A312 419 (1978)
H. Daniel et al. Z. Physlk A291, 29 (1979).
11:45
AD5
Construction and Initial Tests of the Time
Projection Chamber at TRIUÎ'F.* H. MES, C.K. HARCR0"E,
Nat'l. Res. Council, A.L. CARTER, E.P. HINCKS,
D. KESSLER, Carleton U. , D. BRYUAN, P. REEVE, J. SPULLER,
J.A. MACDONALD, TRIUMF, L.B. ROBERTSON, G.A. BEER,
A. 0LIN, R.M. PEARCE, T. NUMAO, U. Victoria,
M. HASIN0FF, J.M. P0UTISS0U, U. British Columbia,
D. DEP0MMIER, J.-P. I1ARTIN, G. AZUEL0S, R. P0UTISS0U,
U. Montreal. K. G0T0W, M. BLECHER, Va. Polvtech. Inst.,
S.C. WRIGHT, Enrico Fermi Inst., H.L. ANDERSON,
R.J. MCKEE, Los Alamos Sci. Lab. - We have designed and
built an apparatus based on the Berkeley Time Projection
Chamber (TPC) of D. Nvgren, et all. The apparatus is
initially to be used in the search for the rare decav of
the muon y~-*e-. Its combination of large solid angle,
high resolution and simplified detection svstem makes it
ideal for this purpose. The design and construction of
this apparatus will be described. Initial tests on
cosmic rays, and stopping pions and muons will be described to illustrate the operation of the instrument.
Nygren, D. et al, PEP-4 proposal.
Partially supported by Nat. Sci. & Engr. Res. Council.
MONDAY, JUNE 16. 1980
ROOM BS B103
Chairman: R.G. Summers-Gill
9:00
AE1
NUCLEAR PHYSICS A
Yrast Traps at High Spin*
P. Taras, UrUvzAiiXi de MonfiêaC
The p r o p e r t i e s o f several Yrast isomers and very high spin Yrast states in 1
' » '51.152^
144, |46,147,I48cd have been i n v e s t i g a t e d using a large panoply o f y-ray spectroscopy techniques
a p p l i e d to heavy ion reactions. Their e x c i t a t i o n energies, small Y~ray decay t r a n s i t i o n p r o b a b i l i t i e s , q u a s i - p a r t i c l e configurations and quadrupole moments, when considered as a whole, i n d i c a t e
that nuclei near N = 82 have a s u b s t a n t i a l oblate deformation, B "v. - 0 . 2 , at high spin I "V/ 30fi. This
o b l a t e deformation would a r i s e from the s i n g l e - p a r t i c l e s a l i g n i n g t h e i r spins along the symmetry
axis o f the nucleus.
(*) Most o f the work reported in t h i s paper has been c a r r i e d out at the Chalk River Nuclear
Laboratories in c o l l a b o r a t i o n w i t h T.K. Alexander, H.R. Andrews, 0. Hausser, D. Ward, E. Mahnke,
B. Haas, W, Trautmann, J. Sharpey-Schafer, T.L. Khoo and M.L. Swanson. The work has been p a r t i a l l y
financed by the Natural Sciences and Engineering Research Council of Canada.
9:45
AE2 The particle-hole nucleus ll<6Eu.* A. ISLAM,
K. LENESTOUR and R.G. SUMMERS-GILL, McMaster University,
Hamilton—Four low-lying levels of 'l,6Eu have been
extensively studied in the decay of ll,6Gd.
It is also
well established that there is a 235 us isomer which
emits 3 prominent Y-rays of 275, 358 and 377 keV. Reports about any other reaction study are non-existent.
With various beams from the McMaster tandem accelerator
we have undertaken different reactions leading to this
interesting particle-hole nucleus. The y-decay modes
were studied using 11)7Sm(p,2n) at E p = 14, 16 and 17.5
MeV, and y-y coincidence data were obtained at 16 MeV
beam energy. A partial level scheme can be constructed
on the basis of coincidence data alone. The particle
transfer reaction 1'*',Sm(3He,p) at 24 MeV shows that the
low-lying levels have very small cross sections. A
group of levels at higher excitation (642
E x <_ 1200)
is much more strongly populated. Our conversion elecll<2
7
tron study, using the
Nd( Li,3n) reaction with a
pulsed beam, suggests that the 275, 358 and 377 keV
Y-rays are predominantly Ml.
1
Table of Isotopes, seventh edition, 1978
*
Supported by NSERC
10:00
AE3 The Structure of tha Nucleus '"Tb*, T.A. KHAN
and M.W. JOHNS, McMaster University, Hamilton—The
nucleus l 8 2Gdeii has recently been shown to be a good
example of a doubly closed shell nucleus since the Z=64
proton subshell Is nearly as well closed in this region
as the N=82 neutron shell*). 'e^Tbes thus belongs to
that rare species of nuclei with a single proton outside a doubly closed shell core. It is thus ideally
suited to test the predictions of the shell model. The
nucleus has been investigated in depth with the techniques of in beam y-ray
and conversion electron spectroscopy using the ( 6 Li,3n) reaction. The results of these
investigations will be presented and discussed in the
light of recent calculations.
*
Supported by NSERC
1) P. Kleinheinz et al.
10:15
Z. Physik A290 (1979) 279.
Break
10:30 - 11:15
AE4
Solar Neutrino Problem
R.E. Azuma, UnLveAJs-iXy of Tolonto
11:15
AE5
High Precision Curved Crystal Spectrometry in the
lb
'Er(n,Y) Iba Er
Reaction.
W^F.
DAVIDSON,
ILL
Grenoble and NRC Ottawa.
- In the nucleus 16SË7
20 rotational bands, comprising 82 levels and 335
de-exciting Y-transitions,
have
been
established
following curved crystal, conversion electron, Ge(Li)
and average resonance capture measurements.
All
states observed up to ^2.2 MeV in excitation can be
accounted for.
The complementarity of this study
vis-à-vis
in-beam
Y-ray
measurements,
and
our
understanding of the results in terms of the IBA
model, will be discussed.
11:30
AE6
Radon Daughters i n A i r and Their Gamma
Activity.
MUHAMMAD IRFAN, Memorial U n i v e r s i t y of
Newfoundland - We have r e c e n t l y shown1 t h a t r e l a t i v e
concentrations of radon daughters, RaA, RaB and RaC,
can be determined by measuring, over several small time
i n t e r v a l s , the Integrated gamma a c t i v i t y counts due to
RaC c o l l e c t e d on a f i l t e r through which a i r i s sampled
f o r a short time. Absolute values of concentrations
can be determined by using a s u i t a b l e reference source.
In the present communication i t 1s shown t h a t the
combined gamma a c t i v i t y of (RaB + RaC) instead of RaC
only can be used to determine the atmospheric radon
daughter concentrations. This improvement allows us to
u t i l i z e a l a r g e r part of the observed gamma spectrum
r e s u l t i n g 1n greater e f f i c i e n c y and higher s t a t i s t i c a l
accuracy.
h r f a n , M. and Fagan, A. J . , Nucl. I n s t r . and Meth. 166,
567 (1979).
11:45
AE7 The L e v e l S t r u c t u r e o f 1 2 1 Xe.
SOFIA, B . N . SUBBA RAO and J . E . CRAWFORD,
M c G i l l U n i v e r s i t v . - - ' 2 1 C s has been p r o d u c e d
by t h e ( p , 4 n ) r e a c t i o n on 124xe gas t a r g e t s ,
and t h e 6+ d e c a y o f t h i s i s o t o p e t o ^ 21Xe has
been s t u d i e d .
The h a l f - l i f e f o r t h e decay i s
2 . 1 ± 0 . 1 m i n , and p r e l i m i n a r y e v i d e n c e
s u g g e s t s t h e e x i s t e n c e o f an i s o m e r w i t h
n e a r l y t h e same l i f e t i m e .
The l e v e l scheme
deduced w i l l be compared w i t h t h e s y s t e m a t i c s
o f t h e odd-A n u c l e i i n t h i s t r a n s i t i o n a l
reg i o n .
•Work
supported
by NSERC, Canada
7
MONDAY, JUNE 16, 1980
ROOM SS 165
Chairman:
B.P. S t o i c h e f f and J . L .
MOLECULAR PHYSICS
Hunt
9:00
AF1
Role o f V i b r a t i o n a l E x c i t e d Ions i n E l e c t r o n - I o n
Recombination and D i s s o c i a t i o n Experiments
A. SEN
C.NG, V. D'ANGEID, P.MUL, J . B . A . MITCHELL, J.WM.MCGOWAN
The U n i v e r s i t y o f Western O n t a r i o .
Our s t u d i e s o f e l e c t r o n - i o n i n t e r a c t i o n i n the merged
e l e c t r o n - i o n beam experiment (MEIBE-I) have c o n t i n u e d
w i t h s p e c i a l emphasis upon the r o l e o f i n t e r n a l
e x c i t a t i o n upon c r o s s - s e c t i o n s .
We have now determined
t h a t f o r both H~+ and H , + small numbers o f h i g h l y
e x c i t e d v i b r a t i o n a l ions have a s u b s t a n t i a l a f f e c t .
To study t h i s e f f e c t we have b u i l t a Teloy t y p e R.F.
i o n t r a p which we use t o age t h e ions b e f o r e they e n t e r
into electron-ion c o l l i s i o n .
I n t h i s way we c o n t r o l
vibrational excitation.
Our s t u d i e s have d i r e c t
a p p l i c a t i o n t o f u s i o n and t o i n t e r s t e l l a r space.
9:15
AF2
L a s e r M a g n e t i c R e s o n a n c e S p e c t r u m of
BrO.
A . R . W . M c K E L L A R , H e r z b e r g Inst, of A s t r o p h y s . , N R C C , O t t a w a - T h e z n 1 / 2 •«-zn3 / 2 t r a n s I t i o n b e t w e e n the two c o m p o n e n t s of the g r o u n d
e l e c t r o n i c state of BrO h a s been observed by
m a g n e t i c a l l y t u n i n g BrO t r a n s i t i o n s Into r e s o nance w i t h C 0 2 laser lines a r o u n d 10.3 um.
The
s h o r t - l i v e d BrO r a d l c a l s w e r e p r o d u c e d in a cell
l o c a t e d i n s i d e the laser c a v i t y by m i x i n g B r 2
with discharged 0 2 .
The observed transitions
are m a g n e t i c d i p o l e a l l o w e d , and the s p e c t r u m
is c o m p l i c a t e d by the two I s o t o p e s , 7 9 B r and
81
B r , by n u c l e a r h y p e r f i n e s t r u c t u r e ( 1 = 1 . 5
for b o t h i s o t o p e s ) , and by A - t y p e d o u b l i n g .
T h i s e x p e r i m e n t is the first o b s e r v a t i o n of
2
n 1 / 2 , and thus p r o v i d e s the f i r s t d i r e c t
m e a s u r e m e n t s of the s p i n - o r b i t i n t e r a c t i o n A,
the r o t a t i o n a l c o n s t a n t B for 2 n i / 2 , the h y p e r fine p a r a m e t e r s d and (b + c), and the A - d o u b ling p a r a m e t e r p.
T h e only p r e v i o u s d e t e r m i n a t i o n s of A _ w e r e - 8 1 5 cm 1 , from EPR s t u d i e s ,
1
and - 9 8 0 cm , as e s t i m a t e d from k n o w n atomic
parameters.
The p r e s e n t w o r k y i e l d s v a l u e s of
A = - 9 6 7 . 9 8 3 c m - 1 ( 7 9 B r O ) and - 9 6 7 . 9 9 8 cm 1
81
( BrO).
9:30
AF3
Vlbratlonall.y-Induced eQq In Td and O h
Molecules.
JON T. H O U G E N , N B S , W a s h i n g t o n
and T A K E S H I O K A , N R C C , O t t a w a - H y p e r f i n e
s p l i t t i n g s a r i s i n g from the p r e s e n c e o f a
q u a d r u p o l a r n u c l e u s at the centre of a
m o l e c u l e b e l o n g i n g to the p o i n t group Td or
O h (e.g., 1 8 9 O s O ^ or 2 3 5 U F 6 ) a r e s y m m e t r y
f o r b i d d e n to a h i g h d e g r e e of a p p r o x i m a t i o n .
N e v e r t h e l e s s , q u a d r u p o l e s p l i t t i n g s can be
i n d u c e d by e i t h e r v i b r a t i o n a l or r o t a t i o n a l
d i s t o r t i o n s of the m o l e c u l e , i.e. by
d i s t o r t i o n s s i m i l a r to t h o s e r e s p o n s i b l e for
i n d u c i n g e l e c t r i c d i p o l e m o m e n t s in Td
molecules.
In this p a p e r w e I n v e s t i g a t e
t h e o r e t i c a l l y the q u a d r u p o l e s p l i t t i n g s
i n d u c e d by e x c i t a t i o n of d o u b l y and t r i p l y
d e g e n e r a t e v i b r a t i o n s in Td and O h m o l e c u l e s .
V a l u e s for the s c a l a r and t e n s o r c o n t r i b u t i o n
for the q u a d r u p o l e c o u p l i n g c o n s t a n t have b e e n
d e r i v e d from the e x p e r i m e n t a l d a t a by B o r d é
et al. for OsOi,.
9:45
AF4
Moments of Lines in Collision Induced
Absorption and Light Scattering.* J.D. POLL, and
T. ORLIKOWSKI, Dept. of Physics, University of
Guelph - Expressions for two moments of collision
induced lines for absorption and light scattering
are presently known. High moments have so far
been treated in the classical limit only. We will
present a quantum mechanical expression for the
third moment and discuss how it can conveniently be
calculated numerically using the method of path
integrals. An application to the infrared
absorption of a He-Ar mixture will be given.
•Supported by NSERC.
10:00
Break
10:15
AF5
COy-He and C02-Np L i n e Broadening C o e f f i c i e n t s
a t Elevated 1emperatures. A.M. Kobinson, h.L. Uept77~
U o f A1berta
- Comparison o f C a l c u l a t e d and e x p e r i mental v a l u e s o f l i n e - c e n t e r a b s o r p t i o n c o e f f i c i e n t s
o f the R(T0)-R(24) 10.4ym CO? l a s e r t r a n s i t i o n s p r e d i c t
a l i n e w i d t h v a r y i n g as T " ° • 5 2 over the temperature
range 300sT<650K. R e s u l t s o f measurements o f the s e l f broadening c o e f f i c i e n t s o f t h e C02 l a s e r R ( 1 6 ) - R ( 2 2 )
and P ( 1 6 ) - P ( 2 2 ) 10.4um l a s e r t r a n s i t i o n s due t o He and
N2 i n the p r e s s u r e broadened r e g i o n are presented as
a f u n c t i o n of temperature.
The r e s u l t s a r e independent
o f the v a r i a t i o n o f l i n e w i d t h w i t h t e m p e r a t u r e . A
method f o r c a l c u l a t i n g the a b s o r p t i o n c o e f f i c i e n t f o r
C02-He and C O g ^ m i x t u r e s i s presented based on the
a b s o r p t i o n c o e f f i c i e n t and f r a c t i o n o f CO2 i n the
mixture.
10:30
AF6
Quadrupolar Si(J) + Sp(j) Transitions in
Molecular Deuterium at 77 K. * R. D. G. PRASAD and
S. PADDI REDDY, ffemorlal University of Newfoundland Double transitions Si(J) + So(J) corresponding to a
vibrational-rotational transition Av = +1 and AJ = +2 in
one molecule and a pure rotational transition AJ = +2 in
its collision partner, both occurring simultaneously,
have "been observed in the infrared fundamental band of
normal I5 at 77 K for gas densities in the range 50 to
170 amagat. These transitions arise because of the
contribution of the intermolecular interaction by the
anisotropic component of the polarizability of one
molecule in the quadrupole field of the other and occur
in the high wavenumber wing of the relatively strong
Si(j) and Qi(j) + So(J) components of the band. The
absorption profiles were analyzed by assuming appropriate line-shape functions. The results of the analysis
were compared with those for similar transitions in H2
reported recently from our laboratory^.
•^en, A., Prasad, R. D. G. , Reddy, S.P. , J. Chem. Phys.
72, lTlé (1980)
•Supported by NSERC Canada
10:45
AF7
Generalized Cross Sections Determining the
Effect of Magnetic Fields on Gas Transport Properties.*
W.K. LIU, Caltech and F.R. McCOURT, Univ. Waterloo—
The structure of cross sections pertinent to the
magnetic field dependence of transport coefficients of
polyatomic gases will be discussed from the point of
view of Liouville space formalism and rotational invariance arguments. The cross sections will be expressed
in terms of S-matrix elements in the tota^J representation. Symmetrization arguments to account for indistinguishability in a pure gas will be presented. The
use of field-effect measurements for the determination
of the anisotropic part of intermolecular potentials
will also be discussed.
*Supported in part by a NSERC grant
11:00
AF8
Single Photon Infrared Photodissociation Spectra
of (C02)_ Cluster Beams. T.E. GOUGH, R.E. MILLER*-®) and
G. SCOLES^a), The Guelph-Waterloo Centre for Graduate
Work in Chemistry, University of Waterloo - We present
the results of experiments showing the vibrational predissociation of carbon dioxide clusters. At low source
pressures, with dilute mixtures of carbon dioxide in
helium, it is possible to produce a beam in which the
C0 2 dimer is, essentially, the only complex present.
Under these conditions an absorption is observed centered
around 4 cm 1 to the red of the Vj + V 3 band of C0 2 ,
Its dependence on source pressure indicates that It is
mainly due to C0 2 dimers. This feature is fairly well
represented by a Lorentzian lineshape having a F.W.H.M.
of approximately 3 cm
Attributing this linewidth to
the lifetime of the excited state of the complex, the
lifetime can be estimated to be 3 x 10 - 1 1 sec. The
presence of inhomogeneous broadening could increase this
value considerably. However, the time of flight of the
beam from the point of irradiation to the bolometer
establishes an upper limit of 10 " sec. At higher
source pressures, and with richer mixtures of C02 in He,
the band is observed to shift to low frequencies suggesting the presence of higher clusters having spectra
further shifted to the red.
(a)
v
'Physics Department, University of Waterloo
11:15
AF9 A Rapid Scanning Far-Infrared Interferometer
With a Hydrostatic Pumped-011 Bearing. T. TIMUSK and
F.K. LIN, McMaster U. - A laser controlled rapid
scanning far-infrared interferometer is described. The
moving mirror is driven by a loudspeaker-type motor and
is controlled by a digital servo system that uses the
zero-crossings of He-Ne fringes as reference. At a
speed of 0.12 cm/sec the standard deviation of the time
interval between He-Ne fringes is 0.4%. A white-light
interferometer is used as phase reference for the
coaddition of interferograms. The three separate
interferometric systems use a common mylar
beamsplitter.
11:30
AF10
Programable Controller for the Regulation of
Monochromator Intensity Output*. B. RAMADAN, Y. LEUNG
and J.F. KOS, U of Regina - The design and operation of
a programable controller to regulate the intensity output of a monochromator between 300 and 1100 nm is
discussed.
* Supported by the Saskatchewan Research Council and by
a Strategic Grant from N.S.E.R.C.
11:45
AF11
Measurement of Sulphur Dioxide Emissions from
La Soufriere Volcano, St. Vincent, West Indies.
R.M. H0FF, Atmospheric Environment Service - During the
April/May 1979 eruptions of La Soufriere Volcano, a
team from Environment Canada monitored the emissions of
SO2 from the volcano into the troposphere using a
correlation spectrometer. The mean daily SO2 mass flux
was 340 ± 125 metric tonnes. This value will be
discussed with reference to other volcanic sources and
it is believed that volcanic emissions contribute only
a small fraction of the total worldwide tropospheric
sulphur dioxide loading.
PHASE TRANSITIONS
MONDAY, JUNE 16, 1980
ROOM SS 271
Chairman: L.G. Caron
9:00
AGI
Coherent, Cooperative Phenomena in Nonlinear Physical Systems and Solitons
J.F. Currle, I cole Polytechnique
Nonlinear coherent phenomena have been the subject of some of the most Interesting recent advances
in statistical and condensed matter physics. This progress is due partially to the application of
new nonlinear mathematical techniques and partially to a growth in awareness of the physical consequences of certain forms of nonlinearity. An important idea which has emerged is that one can approach, in a common way, a wide variety of seemingly different physical systems. A second idea is that
models for such systems must necessarily go beyond a linear normal mode (phonon, magnon, meson) basis
and first order perturbation theories to describe large amplitude structures and excitations of intrinsically nonlinear problems. This talk is intended as an introduction to this subject and to a selection of current research topics:(l)Ferroelectrics: domain wall mechanics near equilibrium.(2)Fluxons
and dislocations: soliton statistical mechanics in ID.(3)0scillating chemical reactions: nonlinear
dissipative structures.(4)Shape memory alloys: martensltic phase transformation.
DEMONSTRATIONS ACCOMPANY THE PRESENTATION.
9:45
AG2
Dielectric Study of the Cooperative Jahn-Teller
Phase Transition in DyVOU. J.H. PAGE and D.R. TAYLOR,
Queen's Univ. - Dielectric susceptibility measurements
have been performed near the cooperative Jahn-Teller
phase transition (TD = lL K) in DyVOi,. Although the
transition is second-order, the data do not agree with
simple mean-field theory but can be interpreted using a
"compressible" Ising model similar to that developed to
explain the first-order phase transition in the isomorphous compound DyAsO^.1 Hence the effective exchange
interaction increases with ordering according to the
relation J 1 = J£(l + ç<o z > 2 ), where <oz> is the order
parameter and ç measures the amount of "compressibility'.'
For ç <
the transition is second-order in meanfield theory. Our results show that ç = .25 consistent
with this prediction and in good agreement with the
value obtained by Gehring, Harley and Macfarlane (to be
published) from birefringence measurements. The total
odd-symmetry coupling constant J u which describes the
dielectric response appears to be the same order of
magnitude in ByVOl, and ByAsOl,.
'j.H. Page, S.R.P. Smith, D.R. Taylor and R.T. Harley,
J. Phys. C: Solid State Phys. 12, L875 (1979).
10:00
AG3
Dynamic Phase Transition of Graphite to Diamonds.
J. KLEIMAN, H. MAR, N. SALANSKY, 3M CANADA INC., INSTITUTE
FOR AEROSPACE STUDIES» - Graphite has been transformed to
diamonds under various conditions of extreme tençerature
and pressure*-^. However, there is still no clear understanding of the dynamic phase tr&Jisition mechanism of this
system, especially in the region of high pressures and
relatively low temperatures. This research is an attempt
to add to the understanding of the transition in this area
of the phase diagram for different types of graphites
using catalysers. We also desire to find the necessary
thermodynamic conditions for the phase transition in terms
of the times for which the pressure is applied. Samples of
iron/graphite as well as copper/graphite of various composition and different initial densities were subjected to
focused shock waves measured up ~o IMbar and temperatures
estimated to be greater than 3000°K. These conditions were
achieved using a spherical implosion chamber with less than
150 gms of the explosive PEITJ. The yield and size (up to
50 m) of the obtained diamond particle within the P.T phase
diagram and its dependence on the initial graphite condition
are discussed.
1.
2.
DeCarli, P. S., Science, 133, 1821 (1961)
Trueb, L. 7.,J. Appl. Phys. 32.(10), 1*707 (1968)
•Supported by NRC of Canada.
9
10:15
AG4
High Resolution Heat Capacity Measurements
near Liquid Crystal C r i t i c a l Points. K.J. Lushinqton,
G.B. Kasting and C.W. Garland, Department of
Chemistry, Massachusetts I n s t i t u t e of Technology High precision a . c . c a l o r i m e t r i c measurements on
several l i q u i d c r y s t a l s near t h e i r smectic A to
nematlc c r i t i c a l point have shown t h a t the super
f l u i d analogy f o r t h i s t r a n s i t i o n 1s not v a l i d . The
values found f o r the c r i t i c a l exponent, a, do n o t ,
however, f i t any known u n i v e r s a l i t y group.
10:30
Break
10:45
AG5
E x p e r i m e n t a l Study of the M a g n e t i c
P h a s e D i a g r a m of C h r o m i u m * E. F A W C E T T , D . F E D E R
and G . L O R I N C Z , D e p a r t m e n t o f P h y s i c s , U n i v .
of T o r o n t o , T o r o n t o M 5 S 1A7 - We have m e a s u r e d
J h e a t t e n u a t i o n a of u l t r a s o u n d o f w a v e - v e c t o r
q in s i n g l e - Q c h r o m i u m in m a g n e t i c f i e l d s H u g
to 11 T n e a r the s p i n - f l i p t e m p e r a t u r e T s ^ .
H
is a p p l i e d a t v a r i o u s a n g l e s 0 to Q and p e a k s
in a(T) or a(H) i n d i c a t e p h a s e t r a n s i t i o n s .
F o r s m a l l v a l u e s o f 0 w e o b s e r v e a p h a s e trans i t i o n a t w h a t a p p e a r s to b e t h e c r i t i c a l endp o i n t p r e d i c t e d by a L a n d a u t h e o r y 1 .
Another
p h a s e t r a n s i t i o n and a t r i p l e p o i n t , w h i c h a r e
only o b s e r v e d for q X 5, a r e a l s o in a c c o r d a n c e
vjith^theory.
W e a l s o o b s e r v e at 20 M H z w h e n
H J. q x Q a r e m a r k a b l y h i g h and n a r r o w p e a k in
a for H > 2T, w h i c h h a s a t h r e s h o l d f r e q u e n c y
b e t w e e n Î0 M H z and 20 M H z , s u g g e s t i n g that it
is r e l a t e d s o m e h o w to a s p i n - w a v e m o d e .
(1)
Z. Barak and M . B . W a l k e r
(following
' S u p p o r t e d by N a t u r a l S c i e n c e s and
Research Council
paper)
Engineering
11:00
AG6
Theory of the Magnetic Phase Diagram of Chromium
near its Spin Flop Transition*. Z. BARAK and M.B.
WALKER, Dept. of Physics, U. of Toronto.
11:15
AG7
I n c o m m e n s u r a t e - C o m m e n s u r a t e (IC) T r a n s i t i o n in g r M n and Ç r F e A l l o y s * .
S. ZOCHOWSKI,
C . M U I R and E. F A W C E T T , D e p a r t m e n t o f P h y s i c s ,
U n i v e r s i t y of T o r o n t o , T o r o n t o M 5 S 1A7 - W e
have m e a s u r e d the u l t r a s o n i c a t t e n u a t i o n a of
a Cr 0.3 a t % M n s a m p l e as a f u n c t i o n of m a g netic field H and t e m p e r a t u r e T t h r o u g h t h e
r e g i o n of the IC t r a n s i t i o n of the s p i n d e n s i t y
w a v e (SDW).
In zero field a is h y s t e r e t i c
w i t h AT ^ 20 K and a is large in the C - p h a s e
( h i g h - t e m p e r a t u r e ) , d r o p p i n g a b r u p t l y to a low
c o n s t a n t v a l u e w h e n f i r s t the I - p h a s e a p p e a r s .
In a f i e l d , H ^ 10 T, s t r o n g and h y s t e r e t i c
a-anomalies appear.
Work is a l s o in p r o g r e s s
o n d i l u t e C r F e a l l o y s , w h i c h s h o w s i m i l a r zerofield a n o m a l i e s .
In b o t h c a s e s a is larger in
the C - p h a s e (low-temperature in Ç r F e ) q u i t e
u n e x p e c t e d l y s i n c e by a n a l o g y w i t h pure Cr o n e
would expect the incommensurate transverse
SDW p h a s e to h a v e the larger a.
' S u p p o r t e d by N a t u r a l
Research Council
Engineering
11:30
AG8
Nuclear Relaxation Due to Transverse Fluctuations In A One-Dimensional XY Chain. D.R. TAYLOR,
Queen's Univ. - ^ C H NQR in PrCi^1 showed an unusual,
nearly linear increase of T 2 with temperature which has
not previously been explained. Recent work 2 has identified PrCl3 and related compounds as one-dimensional XY
systems. The Pr moment which transforms as S z is magnetic, while the moments transforming as S x , Sy are electric. Fluctuations in either type of moment can induce
35
Clt relaxation, but analysis of the correlation functions <S^(t)sJ(o)> shows that the magnetic linewidth
decreases as the temperature is lowered. On the other
hand transverse correlations <S^(t)sJ(o)> develop
a long t" 2 tail at low temperatures giving a strongly
enhanced, linewidth. The full temperature dependence of
<si(t)S^(o)> is not known, but estimates based on the
lov- and high-temperature limits and known interaction
parameters are consistent with the data. Hence this
system appears to provide the first manifestation of
transverse fluctuations of an XY chain.
X
2
•Supported by NSERC
S c i e n c e s and
B.W. Mangum et al, Phys. Rev. Lett. 22, 1105 (1969).
D.R. Taylor, Phys. Rev. Lett. h2_, 1302 (1979).
11:45
AG9
The Detection of Phase Transition in NHi,Sm(S0iJ ?
•4H?0 Single Crystals Using Electron Paramagnetic
Resonance of Gd J + Impurity Ions. H. A. BUCKMASTER and
V. M. MALHOTRA, Phys. Dept. Univ. of Calgary, Calgary The 9.4 GHz electron paramagnetic resonance (EPR) of Gd 3 +
impurity ions in NHt+Sm(SOt|) 2 *4h20 single crystals has
been studied at 101-298K. The Gd 3 + impurity ions are
found to substitute for the trivalent lanthanide in two
inequivalent magnetic complexes corresponding to the
tetra-molecular unit cell. The EPR spectra at 294K have
been analyzed using an orthorhombic symmetry spinHamiltonian. The observation of resolved Gd 3 + impurity
ion spectra in the presence of paramagnetic Sm 3 + ions
has been interpreted in terms of random modulation of
the interaction between the G d 3 + impurity and S m 3 + host
ions. The spin-lattice relaxation time of Sm 3 + ions has
been estimated at 294K from the impurity ion linewidth
and is found to be consistent with an Orbach resonance
process. The temperature dependence of the EPR total
zero field splitting, linewidths and intensities has
been used to show for the first time that NHt+Sm(S0i+) 2 •
4H 2 0 single crystals have the transition sequence lOlK"^
••Phase I
>158(1), Phase II ,i 6 6 (p,Phase III | 2 6 6 ( 1 } < Phase
-ISL298K.
Work
supported
by NSERC and Univ. of Calgary.
10
MONDAY, JUNE 16, 1980
ROOM SS 163
Chairman: W.A. Pieczonka
13:30
BA1
INDUSTRIAL & APPLIED PHYSICS I I
Why Innovation is Virtually Impossible in Canada
George Sinclair, SinclaiA. Radio LabolatoAi&i Limited
There can be little doubt that is virtually impossible to create industrial innovations of
significant magnitude in Canada today. There is a growing realization in the governments of the
industrialized nations that science policies have failed to produce the marvellous benefits promised
by their advocates. These advocates are now promoting technology policies as the panacea for our
industrial and economic ills, but there is little reason for believing they will succeed. The plain
fact is that our economic and industrial policy makers have no notion of how to encourage
innovation or even how to solve our serious economic situation. An attempt will be made to identify
the reasons for this astonishing failure of the decision making processes.
14:15
BA2
The Industrial Applications of Microelectronics Center
Witold Kinsner, V-Oie.cX.ol of Reieaich, The ïndmtAijxl Applications of UlcAoetecOionia Centefi
15:00
Break
15:15
BA3
Beyond the Laboratory Door
Thomas E. Clarke, VleAident, Innovation Management InitiXwte of Canada
Although they are important players in the technological innovation proc ess, most
scientists do not have a clear understanding of the many critical decisi ons that
go in to developing a successful new product or process, This inadéquat e prépara tion
for involvement in technological innovation is, in most part, due to the short si ghtedness of university faculty in failing to provide their s tudents with inf ormation on
how to commercialize technical ideas. This paper will d escribe how this educatio nal
deficiency can be remedied as well as highlight some of the questions wh ich have to be
asked after the scientist has finished proving the techn ical feasibility of a pro spective
new product or process. Some of the numerous barriers t o innovation whi ch must b e
overcome are presented.
16:00
BA4
A Venture Capitalist's View of Entrepreneurs
D.c. Webster, President, Helix lnve&tmentt>
16:45
BA5
Getting High Technology Products to Market
Roger More, Piofei&oi, School of Buiineii Adminiitlation, Unive/uity of OleAteAn Ontario
11
MONDAY, JUNE 16, 1980
ROOM BS 108
Chairman: E. Fenton
LOW TEMPERATURE
13:30
BB1
Equilibrium Data and Kinetics of the Transition Between the Close-Packed Phases of Solid 'He.
J.P. Franck, UnlveJi&lty of AlbeAta and UnlveAilty of VelawaAe
The transition hep
fee He was studied from the triple point at T = 14.99 K and P = 1.129 kbar
to about 9 kbar using thermal analysis and elliptometry. The transition is extremely weak, with
a transition entropy of 18.3 mJ/mole-K. Near the triple point the transition shows singular
behaviour. The equilibrium data will be compared with theoretical predictions of the transition.
The transition shows temperature hysteresis between the heating and cooling transition, its
progress is athermal, showing frequently burst-like phenomena. Isothermal transition studies
showed extremely long time constants (many hours) leading to almost complete transition in
heating, but not in cooling. Stabilization of the cooling transition was also observed. It is
probable that the transition is of martensitic type.
14:15
BB2
Phonon-Quasi Particle Coupling in Dilute Liquid
3
He-'*He Mixtures* F. GUILLON, J.P. HARRISON and A.
TYLER+, Queen's University, Kingston - The thermal resistancebetweeiT~I^He—phonons~and 3 He quasiparticles, is
the dominant resistance to the cooling of dilute mixtures of 3 He in ''He into the millikelvin temperature
range. Experiments are being performed to measure this
resistance using the second sound velocity as a 3 He
quasiparticle thermometer. The 4 He phonon temperature
is being separately monitored with a carbon thermometer
chosen to be in the form of a thin slice for fast response. The experiments will be extended to cells containing sintered sub-micron copper powder to investigate the possible departure from bulk theory for size
limited quasiparticle mean free paths.
Research supported by N.S.E.R.C. and Queen's University
School of Graduate Studies and Research.
On sabbatical leave from University of Manchester.
15:00
Break
15:15
BB5 Superconducting Properties of Hg^_gAsFfi. E.
BATALLA, W.R. DATARS, D. CHART1ER and r 7 j . GILLESPIE,
McMaster University* - Hg^jAsFg has been reported to
become superconducting at U.l K with a critical field of
390 Gl. We have measured the differential susceptibility
of this compound between 0 and 1(00 G at temperatures of
1.2 to 4.2 K. The compound exhibits anisotropy at all
temperatures below 4.1 K. These measurements are interpreted as arising from elemental mercury regions in the
sample.
1
R. Spal et al., Solid State Commun. 32, 6Ul (1979).
•Research supported by NSERC.
14:30
BB3
Magnetic Resonance Studies of Atomic Hydrogen
Gas at Low Temperatures.* W.N. HARDY, M. MORROW, A.J.
BERLINSKY, R. JOCHEMSEN, P. KUBIK, A. LANDESMAN, R.
MARSOLAIS AND B. STATT. - Using a pulsed low temperature discharge in a closed cell containing H 2 and ''He,
we have been able to store a low density (vLO^2 atoms
/cc) gas of atomic hydrogen for periods of order one
hour in zero magnetic field and T - 1°K. Pulsed magnetic resonance at the 1420 MHz hyperfine transition
has been used to study a number of the properties of
the gas, including the recombination rate H + H + ''He
-*• H 2 + 4 He, the hydrogen spin-exchange relaxation rates,
the diffusion coefficient of H in ''He gas and the
pressure shift of the hyperfine frequency due to the
He buffer gas.
15:30
BB6
Dynanlcs of the Intermediate State in a Type-I
Superconducting Wire*. N. GAUTHIER and P. ROCHON, Dept.
of Physics, Royal Military College, Kingston. A new
approach to the dynamics of the intermediate state in
a type-I wire is presented. It represents a generalization of a recent theoryd) of the dynamic resistance
of the wire. It is shown that a large dynamic selfinductance, different from the d.c. value, appears when
mixed d.c. and weak a.c. current conditions are used.
The effects of the wire's environment on the intermediate state dynamics are discussed here for the first
time and the classical skin effect is accounted for to
all orders in the radius to skin-depth ratio. Contact
with e x p e r i m e n t i s also made.
*
•Supported by Chief of Research & Development, Dept. of
National Defence (Canada)
Supported by NSERC.
l-Gauthier, N. and Rochon, P.
325 (1979).
14:45
BB4
Positron Annihilation In Solid Ne and Ar.
from 4 K to Melting.* J.P. HABERL and R.J. DOUGLAS,
Queen's University, Kingston Ont. - The temperature
dependence of the positron lifetime has been measured
in solid Ne and solid Ar. A conventional fast-fast
timing system was used with a variety of scintillators
(1.5" and 3" fast plastic, and 1" CsF). Ne and Ar
samples were grown in situ around a cold finger which
incorporated a free-standing thin Ni foil that supported the 2 2 N a positron source. No evidence of
positron (or positronium) trapping at vacancies was
found. The experimental results will be presented
and compared to calculated temperature dependences
of free-particle lifetimes in Ne and Ar.
* Supported in part by NSERC.
J. Low Temp. Phys. 36,
^wiederick, H.D., Mukherjee, B.K. and Baird, D.C., in
"Proc. 14th Int. Conf. on Low Temp. Phys , NorthHolland, Amsterdam, 1975, Vol. 2, p. 137 also, to be
published.
12
15:45
BB7
An Experimental Investigation of the Dynamic
Resistance of the Current-Induced Intermediate State
in Type-I Superconductors. B.K. MUKHERJEE, J.L. DUNN,
P.D. ROGERS and H.D. WIEDERICK, Dept. of Physics, Royal
Military College, Kingston, Ontario, K7L 2W3 - The
current-induced intermediate state in a wire of a TypeI superconductor is characterized by a d.c. resistance
which is less than that of the wire in its fully normal
state. However, we find that the dynamic resistance
associated with a small alternating current, superimposed on the direct current which induces the intermediate state, is greater than the normal state resistance of the wire in qualitative agreement with the
theory proposed by Gauthier and Rochon (previous
abstract) which is based on the London model of the
intermediate state. Quantitatively better agreement
is obtained if the London model is replaced by the
Baird-Mukherjee model of the intermediate state.
16:15
THE ANNUAL MEETING OF THE DIVISION OF CONDENSED
MONDAY, JUNE 1 6 , 1980
ROOM SS 164
Chairman:
R. B o l t o n
13:30
BC1
16:00
BB8
Easy and Hard Directions of Flux-lines in
Anisotropic Superconductors. M. DENHOFF and S. GYGAX,
Phys. Dept., Simon Fraser U. - The lower critical field
H c ^ of anisotropic single crystals of NbSe2 and TaS2
(pyridine)^ was measured as a function of the angle
between the applied field and the crystal layers.
Crystals of different shapes were used to take into
account demagnetization effects. The measured angular
dependence of Hc]_ features a pronounced cusp at an
angle dependent on crystal anisotropy and sample shape.
The results are discussed in terms of a recent anisotropic Ginsburg-Landau treatment of the probleml.
1
Klemm R.A. and Clem J.R., Phys. Rev. B 21. 1868 (1980).
PHYSICS WILL TAKE PLACE IN ROOM BS 108
MAGNETIC CONFINEMENT OF PLASMAS
Impurity Control in Tokamaks Using Divertors
D. Meade, PAincvton UniveAA-Uty
14:15
BC2
Observation of Rapid Thermal Transport In STOR.*
C. BOUCHER, A. HIROSE, H. KUWAHARA, H.M. SKARSGARD, and
Y. WATANABE, Univ. of Saskatchewan - The rapid thermal
transport through a skin layer previously observed in the
Plasma Betatron^ has been confirmed by laser scattering
measurements in the STOR experiment. The electron temperature and density have been measured at the plasma
center where Joule dissipation is negligible because of a
strong skin effect. The energy density at the center
starts increasing well before the fields penetrate, and
anomalously rapid thermal transport toward the plasma
core is thus evident. For typical discharges with B 1 T, Ip(max.) • 20 kA, the temperature at the center
reaches 1.2 keV at the density of 5xl0 1 3 cm-3. The
energy balance without energy loss holds up to 2 psec
after which the energy density becomes saturated. The
duration of the loss-free stage is relatively independent
of the safety factor q(a), varied from as low as 0.8.
Radial scanning in the laser scattering measurements is
underway and is expected to yield the electron thermal
conductivity.
*
14:45
BC4
Operating Modes of the LT-4 Tokamak. A.H. MORTON,
Plasma Res. Lab., Australian Nat. Univ., Canberra* - The
LT-4 tokamak (R=0.4m, r v =0.14m, a<0.13m) has been designed to operate in a number of aodes Involving different arrangements of power sources for energizing the
toroidal field and ohmic heating circuits. A single
capacitor bank is used to energize both circuits when
discharge cleaning with a repetition rate of a few seconds or when testing or aligning diagnostics. For
short discharge (<10ms) experiments requiring B^.<IT
separate banks are used for each circuit. If a higher
value of B t is required the toroidal field is powered
by a homopolar generator, a capacitor bank producing
plasma current pulses of <15ms. Under these conditions
with I max ~30KA and n ~3xl0 13 cm" 3 typical values of
T , T- and loop volts are respectively 2-300 eV, a few
ms ana ~1.5. In long pulse (~10Gms) operation, for
which a system is being developed, a capacitor bank is
used to initiate the plasma current and the ohmic heating circuit is then connected to a rectified mains
supply.
Research sponsored by the Natural Sciences and Engineer. ing Research Council of Canada.
A
Y. Nishida, A. Hirose, H.M. Skarsgard, Phys. Rev. Lett.
38, 653 (1977).
*At present a visitor to the University of
Saskatchewan, Saskatoon.
14:30
BC3
Design Study of STOR-II. A. HIROSE, A.H. MORTON,
T.B. REMPLE, and H.M. SKARSGARD, Univ. of Saskatchewan STOR-II is a small tokamak (R - 70 cm, a - 15 cm,
B j • 1 I) presently in the design stage. The major objectives are to investigate the feasibility of turbulent
heating as supplementary heating and the 3 limit of tokamaks. Turbulent heating through a skin layer has recently been confirmed in the STOR experiment currently in
operation, and this provides a basis for applying the
heating method on a pre-established tokamak discharge, a
scheme yet to be tried. STOR-II has the following major
features: an air-core transformer with $ a 0.3 Vsec
(the worst stray field at the plasma edge Is s 2 G, or
0.7Z of the vertical field required for equilibrium);
rectangular shaped, demountable toroidal coils; vacuum
chamber of rectangular cross-section with ceramic electrical breaks. Turbulent heating windings are located so
that they can provide an appropriate self-vertical field
during the heating pulse. Decoupling between the turbulent heating windings and other poloidal field windings
can be achieved by proper back windings.
15:00
BC5
C a l c u l d i r e c t des c o u r a n t s r e q u i s dans l e s b o b i nes de champ p o l o T d a l d ' u n TokamaYI
R.A. BOLTON, P.
COUTURE, D i r e c t i o n P r o d u c t i o n e t C o n s e r v a t i o n de l ' é n e r g i e , IREQ, C . P . 1000, Varennes, Québec, Canada, JOL 2P0
e t B.C. GREGORY, INRS-ENERGIE, C.P. 1020, V a r e n n e s ,
Québec, Canada, JOL 2P0.—Les codes d ' é q u i l i b r e MHD pour
des plasmas de Tokamak f o n c t i o n n e n t normalement S p a r t i r
de c o u r a n t s c i r c u l a n t dans l e s b o b i n e s de p o s i t i o n s physiques f i x e s .
La méthode d é c r i t e i c i permet de c a l c u l e r
en f o n c t i o n des paramètres macroscopiques du plasma t o r o T d a l , l e s c o u r a n t s r e q u i s dans l e s b o b i n e s c h o i s i e s .
Les paramètres du plasma g u i d o i v e n t ê t r e s p é c i f i é s s o n t
les dimensions physiques (grand rayon, p e t i t rayon, e l l i p t i c i t é ) , l e c o u r a n t t o t a l e t sa d i s t r i b u t i o n s p a t i a l e
grossière.
A l ' a i d e de c e t t e méthode, on p e u t é t a b l i r
l e s c o u r a n t s pour l e s c o n f i g u r a t i o n s d ' i n d u c t i o n de c o u r a n t de plasma, de champ d ' é q u i l i b r e e t m i x t e .
Ces r é s u l t a t s s o n t u t i l i s é s par l a s u i t e dans l e code d ' é q u i l i b r e dans l e b u t d ' é t a b l i r l e comportement i n t e r n e du
plasma f a c e 3 l a c o n f i g u r a t i o n magnétique donnée.
13
15:15
Break
15:30
BC6
Le Design du Champ Magnétique Poloïdal pour un
Plasma avec Déflecteur dans le Tokamak de Varennes.
J.-P. MATTE, B. GREK, J. GEOFFRION, T.W. JOHNSTON,
B.C. GREGORY, INRS-Energle, Université du Québec, C.P.
1020, Varennes, Québec, JOL 2P0, P. COUTURE, IREQ,
C.P. 1000, Varennes, Québec, JOL 2P0 - La configuration
de bobines pour le champ magnétique poloïdal du Tokamak
de Varennes est établie en utilisant un code d'équilibre MHD qui résout l'équation Grad-Shafranov pour le
flux magnétique. Les éléments de base de ce code seront décrits brièvement. Le code permet la limitation
du plasma par un limiteur matériel ou bien par la séparatrice créée par deux bobines d'un déflecteur poloïdal
Les paramètres tels que la forme, le courant, la pression cinétique et son profil seront présentés pour divers équilibres qui sont possibles avec le choix final
d'une configuration de bobines.
15:45
BC7
Le d e s i g n des b o b i n e s du champ magnétique m u l t i polaire.
P . C O U T U R E , R . R A J O T T E et R . B O C T O N , Direction
P r o d u c t i o n e t C o n s e r v a t i o n de l ' é n e r g i e , IREQ, C.P.
1000, V a r e n n e s , Québec, Canada, JOL 2 P 0 . - - D a n s l e cadre
de l ' é t u d e sur l a s u p e r p o s i t i o n d ' u n champ m u l t i p o l a i r e
5 une c o n f i g u r a t i o n Tokamak, nous avons développé un
programme pour o p t i m i s e r l a g é o m é t r i e m a g n é t i q u e .
Ce
programme a pour b u t de c a l c u l e r l e s c o u r a n t s dans l e s
bobines m u l t i p o l a i r e s e t de d e s s i n e r l e s l i g n e s de f l u x ,
l a l i g n e de f l u x c r i t i q u e a i n s i que l a s é p a r a t r i c e pour
une c o n f i g u r a t i o n m u l t i p o l a i r e avec ou sans c o u r a n t de
plasma.
I l peut ê t r e u t i l i s é i n d i f f é r e m m e n t pour é t u d i e r un mode m u l t i p o l a i r e p u r , c ' e s t - â - d i r e sans c o u r a n t
de plasma ou un mode d é f l e c t e u r avec un c o u r a n t de p l a s ma.
I l e s t i m p o r t a n t de c o n n a î t r e l a l i g n e de f l u x c r i t i q u e c a r e l l e c o r r e s p o n d â l a f r o n t i è r e de s t a b i l i t é
MHD.
I l en e s t de même pour l a s é p a r a t r i c e q u i c o r r e s pond a l a d e r n i è r e l i g n e de f l u x p r i v é .
Les p a r t i c u l e s
3 l ' e x t é r i e u r de l a s é p a r a t r i c e v o n t c o n t o u r n e r l e p l a s ma e t l e s b o b i n e s du d é f l e c t e u r .
16:15
BC9
Magnetic Diffusion and Current Profiles during
Current Reversal*. I . P . SHKAROFSKY, MPB Technologies I n c . ,
and M . SHOUCRI, Inst. de Recherche de H y d r o - Q u é b i c " ^
Computer studies are performed on the temporal changes of
magnetic flux surfaces and current density profiles in a tokamak
(of 25 cm minor radius)undergoing current reversal. The flux
on the plasma boundary is forced to vary in time so as to model
a t o t a l current reversal from positive to negative in about 5ms.
A 2 - D computer code w i t h radial and azimuthal spatial
variations has been w r i t t e n , as w e l l as a simpler 1 - D code w i t h
only radial v a r i a t i o n . A very strong skin current is observed
which lasts very much longer than 5ms, w e l l into the reversed
constant current stage. This occurs even w i t h an enhanced
resistivity factor which increases towards the boundary and w i t h
a temperature p r o f i l e w h i c h decays in time towards zero current.
Both codes show that the required flux v a r i a t i o n is less to ramp
the current down to zero than to produce the negative current
which in turn is less than to e l i m i n a t e the skin current during
the constant negative current stage.
* Supported by the N a t i o n a l Research C o u n c i l , Contract N o .
DSS 0 2 S X . 3 1 1 5 5 - 8 - 0 6 2 3 .
16:30
BC10
Position and Shape diagnostics of a n o n - c i r c u l a r
Tokamak Plasma by Toroidal M u l t i p l e Moment Analysis* A . K . G H O S H . I . P . SHKAROFSKY, S . Y . K . T A M ,
MPB Technologies I n c . , Ste. Anne de Bellevue, Q u e b e c .
The toroidal multipole moment analysis of Zakarov &
Shafranov^ has been extended to include v e r t i c a l asymmetry
and magnetic probes positions around rectengular contour to
derive horizontal and v e r t i c a l displacements and shapes of
the n o n - c i r c u l a r Varennes Tokamak plasma.
Methods of
implementation of the magnetic probes and coils to measure
these moments which relate to position, e l l i p t i c i t y and
t r i a n g u l a r i t y o f the plasma are discussed.
1 . L . E . Zakharov and V . D .
Phys ] 8 , 151 (1973).
*
16:00
BC8
La stabilité, face â des déplacements rigides,
d'un plasma toroïdal entouré d'une configuration de
bobines externes. A. BRIZARD et B. GREK, INRS-Energle,
Université du Québec, C.P. 1020, Varennes, Québec,
JOL 2P0 - Nous établissons analytiquement, un critère
de stabilité pour des déplacements rigides et axisymétriques d'un plasma toroïdal, lorsqu'il est entouré
d'une configuration de bobines. Pour ce faire, nous
supposons que le courant du plasma est confiné à un filament situé sur l'axe magnétique d'un tore de rayon
majeur R, également la position d'équilibre du plasma.
Nous obtenons ainsi une relation entre la forme du plasma et la configuration des bobines stabilisatrices.
Finalement, une comparaison avec une étude numérique du
critère de stabilité ainsi qu'une discussion sur la validité des hypothèses du départ, seront traitées.
Shafranov, Sov. Phys. Tech.
Supported by N a t i o n a l Research C o u n c i l , Contract
DSS02SX.31155-8-0623.
No.
14
MONDAY, JUNE 16, 1980
ROOM SS 271
Chairman: P.A. Bélanger
13:30
BD1
OPTICAL PHYSICS I - LASERS
Injection Mode Locking
P.B. Corkum,
national ReAeatch Counctl of Canada
Injection mode-locking is a simple and versatile scheme for mode-locking high energy C02 (and
other) oscillators. Not only is it applicable to both large and small aperture oscillators,
but it is capable of producing highly reproducible pulse trains which can contain as much (or
more) energy in the peak pulse as would be available if the same gain volune were operated as
a single pass saturated amplifier. Thus injection mode-locked oscillators can potentially
replace linear chain amplifiers for many applications providing a suitable pulse selection
scheme is available. Pulse selection, therefore, has been the subject of considerable research
for both CO, and Nd: Glass lasers. This paper will outline important characteristics of
injection mode-locked oscillators, review seme of the available pulse selection techniques and
discuss the potential applications of injection mode-locked oscillators to (a) high power
plasma physics/fusion lasers, (b) line tunable TEA C03 lasers, and (c) high power picosecond
00j lasers.
14:15
BD2
New Techniques f o r Determining V i b r a t i o n a l Temperatures and Gain L i m i t a t i o n s i n CO? Lasers. C. DANG,
J.REID and B.K. GARSIDE.Dept. of Engineering Physics,
McMaster U n i v e r s i t y - We have developed an accurate method of determining v i b r a t i o n a l temperatures i n C02 d i s charges by using regular 00°1 and sequence 00°2 laser
t r a n s i t i o n s as probes of a C02 laser a m p l i f i e r . Our
probe laser can operate on 5 d i f f e r e n t v i b r a t i o n a l bands,
and d e t a i l e d measurements allow us to make comparisons,
f o r the f i r s t time, between t h e o r e t i c a l models of C02
discharges and d i r e c t experimental determinations of
v i b r a t i o n a l level populations. We report r e s u l t s of
measurements on conventional cw C02 l a s e r s , and on
pulsed TE C02 l a s e r s . The new techniques have been used
p r i m a r i l y t o i n v e s t i g a t e the f a c t o r s which l i m i t gain i n
C02 a m p l i f i e r s at high discharge input energy. The dominant e f f e c t l i m i t i n g gain i n both cw and TE lasers i s
found to be a s a t u r a t i o n of the v 3 mode temperature as
the discharge energy i s increased. This e f f e c t i s not
predicted by conventional models of C02 discharges. We
also describe the use of a tunable diode laser to i n vestigate the v i b r a t i o n a l l e v e l populations in a cw C02
laser.
14:30
BD3
High S e n s i t i v i t y Detection of 14 C0 ? using Tunable Diode Lasers. D. LABRIE and J. REID, Dept. of
Engineering Physics, McMaster U n i v e r s i t y - In recent
years i n f r a r e d laser spectrometry has been proposed as a
technique f o r the measurement of small abundances of
stable and r a d i o a c t i v e isotopes. We have designed a
laser absorption spectrometer (LAS) which i s ideal f o r
t h i s type of a p p l i c a t i o n . The LAS i s based on a tunable
diode laser and a multi-pass o p t i c a l c e l l , and can det e c t absorption c o e f f i c i e n t s as low as 3 x l 0 " 1 0
We
have operated the LAS i n the 4.3 um région, and studied
the very strong v3 band of C0 2 .
Our aim i s to determine the detection l i m i t s of the LAS f o r 11(C02. The
detection of radiocarbon i s of great s c i e n t i f i c i n t e r e s t
f o r use i n b i o l o g i c a l and r a d i o a c t i v e t r a c e r s t u d i e s , and
i n radiocarbon dating. Our present experiments i n d i cate t h a t s e n s i t i v i t i e s of b e t t e r than 1 ppt ll4C02 i n
"normal" C02 can be achieved w i t h a r e l a t i v e l y short
time constant. We discuss the f e a s i b i l i t y of i n f r a r e d
techniques as an a l t e r n a t i v e approach to radiocarbon
d a t i n g , and examine the f a c t o r s which presently l i m i t
the s e n s i t i v i t y of the LAS.
14:45
BD4
Parameters affecting XeCl Pumped U.V. Dye Lasers.
P. CASSARD, T. McKEE*, P.B. CORKUM and A.J. ALCOCK,
Div. of Physics, NBC - With the development of efficient
excimer lasers providing outputs in discrete frequency
bands in the U.V., methods of efficiently shifting the
wavelength are of considerable interest. For wavelengths greater than 325nm relatively efficient U.V. dyes
are available and most of these dyes absorb the 308nm
output of XeCl lasers near the peak of their absorption
curves. This paper describes the parameters affecting
16:00
the performance of a nvmber of U.V. dyes under excitation
by an " 5ns, 308nm pump pulse containing " 50 mJ. The
pimp pulse was produced by a Lumonics TE861 rare gas
halide laser capable of repetition rates between 0 and
200 Hz. Average powers in excess of 1 watt are readily
obtained frcm a sinple untuned U.V. dye laser oscillator.
*Lumonics Research Ltd., Kanata, Ontario.
15:00
BD5
Novel Cavity Configuration f o r a 4.3 um TE COo
Laser.* T.A. ZN0TINS, J. REID, B.K. GARSIDE AND E.A.
BALLIK, Depts. of Physics and Engineering Physics. McMaster University - We have recently reported 1 a technique f o r achieving 4.3 ym l a s i n g which employs TE CO?
lasers both as the o p t i c a l pump and as the 4.3 pu o s c i l lator.
In t h i s cortmunication we describe a foldedc a v i t y c o n f i g u r a t i o n incorporating a g r a t i n g as the
dispersive element which allows both the pump source and
the 4.3 pm gain medium to be placed inside the same resonator. This provides f o r more e f f i c i e n t o p t i c a l pumping by e l i m i n a t i n g i n t e r - c a v i t y coupling losses while
ensuring an e x c e l l e n t matching of l i n e w i d t h s . The res u l t i s a 2 0 - f o l d increase i n 4.3 pm output power and
4.3 um gains i n excess of 6%/cm. Furthermore, the
•iwX>ui-cavity pumping threshold has been reduced to
50 W/cm , supporting the p o s s i b i l i t y of achieving cw
4.3 pm lasing via the present scheme.
]
T . A . Znotins, J. Reid, B.K. Garside and E.A. B a l l i k ,
Opt. L e t t e r 4, (1979) 253
* Work supported i n part by N.S.E.R.C.
15:15
BD6
Self-Induced Pulsations in Heterostructure
Lasers*. T.K. LIM**, B.K. GARSIDE aid J.P. MAHTON,
Dept. of Eng. Phys., McMaster Univ. - An analysis on the
characteristics of self-induced pulsation in double
heterostructure (DHS) junction lasers is presented.
Rate equations for a spatially uniform DHS laser containing a saturable absorber are errployed. By investigating the properties of the CW solutions, the existence
of both the bistable and instability regions under certain conditions are demonstrated. The predicted instability region where pulsation is attainable is in excellent agreement with experimental observation^-. On the
other hand, it is found that self-sustained pulsation
cannot be obtained within the bistable region even
though the CW solutions tend to be unstable. In addition, it is shown that steady-state pulses with repitition frequency in the GHz regime are obtainable frcm the
junction lasers, in good agreement with experimental
results2.
iT.L. Paoli, Appl. Phys. Lett., 34,652 (1979).
2T.L. Paoli, IEEE J. Quant. Electf., QE-13, 351 (1977).
*Supported by the Dept. of Caimunications, Canada.
**Present affiliation: NCR Canada Ltd., Waterloo, Ont.
THE ANNUAL MEETING OF THE DIVISION OF OPTICAL PHYSICS WILL TAKE PLACE IN ROOM SS 271
15
PARTICLE PHYSICS
MONDAY, JUNE 16, 1980
ROOM SS 165
Chairman:
D.G. S t a i r s
13:30
BEI
14:15
BE2
CP Violation
J.W. Cronin, UnlveAilty
of Chicago
A Measurement of the Lifetimes of Charmed Particles
J. Trischuk, McG-M
UnlveAilty
15:00
BE3
A(1405), a CDD pole, and the KN interaction at
low energies.* K.S. KUMAR, Y. NOGAMI and W. VAN D U K ^ ,
McMaster University - In a recent paper^ we proposed a
model for the RN-interaction which departed from the
conventional way of regarding A(1405) as a bound state of
K and N, and treated it instead as an "elementary" particle, as "elementary" as the nucléon or any other baryon. The model, distinctive in having a KN scattering
amplitude with a CDD pole, was able in a single-channel
treatment to explain the unexpectedly small energy shift
associated with the 2p-ls transition in K _ p atoms reported recently. Here we extend the model to include
the TTZ channel, and in this more complete treatment attempt to reproduce the low energy data on the KN system,
including those from the K - p atom.
*K. S. Kumar and Y. Nogami, Kanoic Hydrogen Atom and
A(1405). Phys. Rev. D. in press.
*
Supported by the Natural Sciences and Engineering Research Council.
^Department of Physics, Dordt College, Sioux Center,
Iowa 51250.
16:00
15:15
BE4
Where Have All The Resonances Gone?
An Analysis of Baryon Couplings in a Quark Model with
Chromodynamics. ROMAN KONIUK, and NATHAN ISGUR, U. of
Toronto.- We report on the results of an extensive
analysis of baryon couplings in a quark model with
chromodynamics, encompassing the pseudoscalar and
photon decays of the states associated with up to two
orbital or one radial excitation in the non-relativistic
quark model. The amplitudes which emerge from the
analysis resolve the problem of "missing" baryon
resonances by showing that a very large number of states
essentially decouple from the partial wave analyses;
those resonances which remain are in remarkable
correspondence to the observed states in both their
masses and decay amplitudes.
15:30
BE5
A Study of tt p
yn and n p + n n near Threshold. D.F. Measday, J-M Poutissou, M. Salomon,
University of British Columbia. B. Robertson, Queen's
University - Using the large Nal crystal TINA,
Y-rays have been detected from reactions of n~ incident
on a hydrogen target for T^ = 30 MeV and 40 MeV. Angular distributions have been measured from 30 to 145
for both the reactions ïï +p
y+n and for tt +p
n°+n.
The method is simpler than previous experiments and
should produce more dependable results. Preliminary
cross-sections will be presented.
THE ANNUAL MEETING OF THE DIVISION OF PARTICLE PHYSICS WILL TAKE PLACE IN ROOM SS 165
MONDAY, JUNE 1 6 , 1980
ROOM SS 270
Chairman:
A . A . Harms
13:30
BF1
II
NUCLEAR TECHNIQUES AND REACTOR PHYSICS
Evolution of the McGill On-Line Mass Spectrometer
J.K.P. Lee, FoiteA Radiation LaboAatoAy, UcGUUL UnlveAilty
The o n - l i n e mass s p e c t r o m e t e r was i n s t a l l e d on t h e M c G i l l s y n c h r o c y c l o t r o n
external
beam l i n e i n 1 9 7 3 .
S i n c e t h e n , v a r i o u s m o d i f i c a t i o n s have been
instituted
i n c l u d i n g t h e i o n s o u r c e , beam o p t i c s a n d e v e n t u a l l y t h e t r a n s p o r t a t i o n o f
separated
i s o t o p e s t o a low b a c k g r o u n d a r e a .
The f a c i l i t y has been used f o r t h e s t u d i e s
of
charged-particles
i n d u c e d f i s s i o n , and o f t h e n u c l e a r p r o p e r t i e s o f n e u t r o n r i c h
Rb,
I n a n d Cs i s o t o p e s .
Some o f t h o s e r e s u l t s w i l l
be d i s c u s s e d , a n d t h e f u t u r e
plans
f o r t h e m a s s - s p e c t r o m e t e r w i l l be d e s c r i b e d .
16
14:15
BF2
15:15
P r e c i s e Qg Values f o r " "8-93,
""Rb.
D.M.
Break
REHFIELD
R . B . MOORE and J . K . P . LEE, M c G i l l U n i v e r s i t y . —
S e p a r a t e d Rb i s o t o p e s o b t a i n e d f r o m t h e o n - l i n e
i s o t o p e s e p a r a t o r v i a 2 3 8 ( p , f ) r e a c t i o n s f r o m 100 MeV
p r o t o n s o f t h e M c G i l l s y n c h r o c y c l o t r o n , w e r e measured
i n the superconducting solenoid beta spectrometer w i t h
a Ge(HP) d e t e c t o r .
Response f u n c t i o n s i n c l u d i n g
B r e m s s t r a h l u n g e f f e c t s were used t o e x t r a c t b e t a e n d p o i n t e n e r g i e s , b r a n c h i n g r a t i o s and shape f a c t o r s .
I n g e n e r a l , t h e r e s u l t s a r e i n good a g r e e m e n t w i t h
t h o s e f r o m O S T I S ' . Non s t a t i s t i c a l shape f a c t o r s w e r e
o b t a i n e d f o r t h e decay o f 88Rb and 89Rb. The b r a n c h i n g
r a t i o s obtained are consistent w i t h recent y-spectroscopy s t u d i e s .
For 9 l R b , t h e h i g h e s t e n d - p o i n t energy
branch appears t o feed the ground s t a t e o f 9 1 S r r a t h e r
t h a n t h e 93 keV f i r s t e x c i t e d s t a t e as s u g g e s t e d by
t h e OSTIS r e s u l t .
15:30
BF6
2 3 9 P u Breeding in Fusion Reactor Blankets.
S.A. KUSHNERIUK and P.Y. WONG, Chalk River Nuclear Laboratories^ - Our evaluation of the fissile fuel breeding
potential of DT fusion reactor blankets has been extended to include blankets that contain depleted or natural
uranium for 2 3 9 P u breeding. We have previously reported 1
on evaluation of blankets that contained thorium for
233
U breeding. Neutronically, 2 3 3 U i s a preferable fuel
for thermal fission power reactors. However 2 3 9 P u
breeding ratios in fusion reactor blankets are generally
larger than 2 3 3 U breeding ratios and this along with
other factors could make 2 3 ® P u (or a combination of
239
P u and 2 3 3 U ) breeding desirable. Specific results of
our neutronic evaluations will be presented, and comparisons made.
d e c k e r , Thesis,
Germany, 1979.
's.A. Kushneriuk and P.Y. Hong, " 2 3 3 u Breeding in Fusion
Reactor Blankets", Conference Record - IEEE International Conference on Plasma Science, Montreal, Quebec,
19(1979) .
II
Physikalisches
Institut,
Giessen,
14:30
BF3
An Accurate Monte Carlo Simulation of Electron
Transport.* J.C. WILSON and J.S. HEWITT, Chem. Eng., U.
of Toronto - The transmissions through slabs of monoenergetic beams of electrons with energies up to 10 MeV
have been computed for lead and aluminum. A Monte Carlo
computer program traces electron trajectories by a multiple scattering technique, with angular distribution
and energy loss data based on the theoretical calculations of Goudsmit and Saunderson* supplied by an
auxiliary program. Results are in excellent agreement
(± 2%) with the experimental values of Seliger^ at an
electron energy of 960 keV for transmissions greater
than 10%. At an electron energy of 336 keV, agreement
is still good (± 5%) for aluminum. The shapes of the
transmission curves for 10 MeV electrons are in qualitative agreement with the predictions of Seliger. This
model for electron transport has been developed for use
in SPODE, a computer code for calculating self-powered
detector responses. However, its application in other
areas is expected.
^Goudsmit, S. and Saunderson, J.L., Phys. Rev., 58_, 36
,(1940).
Seliger, H.H., Phys. Rev., 100, 1029 (1955).
* Supported by AECL.
14:45
BF4
The E n e r g e t i c s o f A c c e l e r a t o r - B a s e d T r a n s m u t a t i o n o f N u c l e a r Wastes"
E.M. KRENCIRLOWA and A . A . HARMS,
McMaster U n i v e r s i t y .
- A net energy balance a n a l y s i s i s
u n d e r t a k e n t o f o r m u l a t e an e n e r g e t i c s a s s e s s m e n t f o r t h e
t r a n s m u t a t i o n o f n u c l e a r r a d i o a c t i v e w a s t e s by a c c e l e r a t o r produced p r o t o n s .
The e n e r g e t i c s o f b o t h n u c l e a r
r e a c t o r and a c c e l e r a t o r s y s t e m s i s i n c o r p o r a t e d .
The
t r a n s m u t a t i o n Q - v a l u e , d e f i n e d as 0 = [ t o t a l e l e c t r i c a l
energy g a i n e d ] / [ t o t a l energy expanded] i n t h e p r o d u c t i o n
/ t r a n s m u t a t i o n o f n u c l e a r w a s t e ( s ) , i s t a k e n as t h e
assessment c r i t e r i a .
The e m p h a s i s i s on a c o m p a c t ,
t r a c t a b l e f o r m u l a t i o n f o r the transmutation 0-value from
w h i c h a r e l i a b l e Q u a n t i t a t i v e a s s e s s m e n t can be made.
I t i s found t h a t proton induced t r a n s m u t a t i o n o f s e l e c t i v e r a d i o a c t i v e n u c l e a r w a s t e s b o r d e r s on t h e domain o f
e n e r g e t i c s f e a s i b i l i t y and t h u s i s d e s e r v i n g o f more c o n certed experimental e f f o r t .
15:00
BF5
Comparative C r i t i c a l i t y i n Fusion and F i s s i o n
Reactors.
A . A . HARMS and E.M. KRENCIGLOWA, McMaster
University.
- Some advanced f u e l f u s i o n processes a r e
a n a l y z e d and shown t o oossess m u l t i D l i c a t i v e c h a i n p r o p a g a t i o n c h a r a c t e r i s t i c s ; such f u s i o n c y c l e s thus
bear a n a l o g y t o t h e w e l l known s e l f - s u s t a i n i n g m u l t i p l i < c a t i v e chain reactions c h a r a c t e r i s t i c of conventional
f i s s i o n processes.
The r e a c t i o n k i n e t i c s combined w i t h
t h e i r mathematical r e p r e s e n t a t i o n leads t o a f u n c t i o n a l
r e p r e s e n t a t i o n which d i f f e r s i n some i m p o r t a n t r e s p e c t s ;
a s o l u t i o n f o r the time-dependent
chain c a r r i e r i l l u s t r a t e s t h e s u b s t a n t i a l l y d i f f e r e n t t r a j e c t o r i e s and t h e
a s s o c i a t e d power d e n s i t y v a r i a t i o n s .
I t has been found
t h a t while f i s s i o n excursions are - i n p r i n c i p l e unbounded, a f u s i o n e x c u r s i o n may - under s p e c i f i e d
p a r t i c l e d e n s i t y c o n d i t i o n s - a t t a i n an e l e v a t e d bounded
asymptotic s t a t e .
Both t h e l e v e l and t h e r a t e o f i t s
a t t a i n m e n t a r e v i t a l and new f a c t o r s f o r f u s i o n r e a c t o r
analysis.
15:45
BF7
Study of Neutron-Flux Dynairic Transients in a
CANDU Model with Distributed Irradiations.
B. Rouben,
P. Turyk, and G. Kugler, Atomic Energy of Canada
Limited, Engineering Company. Simulations of dynamic
transients in CANDU reactors are performed with the
space-time kinetics program CERBERUS, based on the
Improved Quas i-Stat ic m e t h o d " ' .
CERBERUS has been
satisfactorily validated against shutdown-system tests
in the commissioning of nuclear generating stations.
The code has heretofore been used with reactor models
in which the fuel irradiation is homogenized over large
core regions. However, widely different irradiations
are in fact present in close vicinity in the reactor,
as a consequence of on-power f u e l i n g .
A new version
of CERBERUS has therefore been recently developed, to
allow the investigation of transients with models in
which lattice properties vary with each fuel bundle,
i.e. in particular models featuring a "snapshot" distribution of irradiations. The paper will present the
program and the analytical method, and will illustrate
these with representative results.
'K.O. Ott and D.A. Meneley, "Accuracy of Quasi-static
Treatment of Spatial Reactor Kinetics", Nucl. Sci. Eng.
36,402 (1969).
16:00
BF8
Automated Time Search for Xenon-Transient
Simulations in CANDU Reactors. M. Younis, G. Kugler
and B. Rouben, Atomic Energy of Canada Limited.
In
reactor problems where the reactor' power and/or configuration changes, the xenon concentration and distribution are perturbed.
It is often desired to determine
the time at which the change in xenon balances the
reactivity change due to the new configuration (or, in
general, to find the time at which the reactor multiplication constant attains a specified value). This
time-search problem previously required multiple costly
trial-and-error program runs. A new, simplified automated procedure has been developed. A single execution
of the 3"d diffusion program which calculates xenon
transients now converges automatically to the desired
time value; 60 to 90 flux-shape iterations are
ordinarily sufficient. The computer cost is thus substantially reduced. This new capability of the code
will be presented and illustrated by sample calculations, including simulations of a CANDU startup
trans ient.
16:15
BF9
Core Design of the 2 MW SLOWPOKE Reactor. N.A.
KELLER and J.W. HILBORN, Atomic Energy of Canada Limited
- Chalk River Nuclear Labs - Ten years of operational
experience with the SLOWPOKE research reactor have
demonstrated the safety and reliability of unattended
reactor operation. This principle is now being adapted
to a 2 MW reactor for industrial and residential hot
water heating. This paper will discuss the general
reactor core characteristics of such a system Including
fuel design, reactivity compensation for fuel burnup,
and safety mechanisms.
17
MONDAY, JUNE 1 6 , 1980
ROOM BS B103
Chairman:
0 . Va1l
13:30
BG1
OPTICAL PROPERTIES
Coupled Defects in Ionic Crystals
J . R o l f e , National RueaAch
Council
otf
Canada
The extra degrees of freedom caused by coupling between defects can lead to some interesting and
useful effects. Two classes of coupled defects will be discussed:
strongly coupled (moleculartype) defects, and weakly coupled defects which can be considered as perturbed point defects.
As an example of the practical use of such coupled defects, the operation of a tunable infrared
laser, the "colour centre laser", will be explained.
14:15
BG2
Theoretical Description of Electronic States of
Impurity F Centres in Alkali Halides? J. M. VAIL,
Univ. of Manitoba, and A. H. HARKER, AERE Harwell, Great
Britain.- A theoretical approach, which previously gave
good agreement with experimental optical absorption and
ground-state ENDOR data for F centres in alkali halides,
has been extended to impurity F centres. We report
results, compared to experiment, for (a) optical absorption of the Fa centre (an F centre with a single small
substitutional nearest-neighbour alkali impurity) in a
range of compounds, (b) optical absorption of the F b
centre (two such impurities), for its two possible configurations, in both KCl:Na and RbCl:Na, (c) hyperfine
interactions of the F a centre in KBr:Li with three inequivalent nearest-neighbour cations, and (d) optical
emission from the type II (saddle-point configuration)
F a centre in KCl:Li.
* Work performed at AERE Harwell, partially supported
by NSERC.
14:30
BG3
Analysis of the Optical Absorption Lineshape of
K I : S n 2 + . V.S. SIVASANKAR and P.W.M. JACOBS, U. Western
Ontario, Canada - Experimental investigation of the
optical absorption spectrum of K I : S n 2 + as a function of
temperature was reported by Tsuboi et al. 1 . In the
present work, the previously-developed theory of s 2 ions
in a crystal field is modified to take into account the
effect of the possible presence of a charge compensating
vacancy in the neighbourhood of the impurity cation.
Also, the effect of quadratic Jahn-Teller interaction
with the Ajg mode is included, besides the linear interaction with the A l g , E g , and T 2 modes. The Monte-Carlo
method which has been used in similar calculations to
compute the multi-dimensional integral over the interaction mode coordinates is replaced in our calculation
by the use of a suitable Gaussian quadrature formula.
The results conform with the expected coexistence of
cubic and tetragonal centers. It is suggested that the
minor residual disagreement between theory and experiment may be due to the neglect of the quadratic JahnTeller interaction with the E„ and T
'Tsuboi T, Nakai Y. , Oyama K.
2g
mode
and Jacobs P.W.M., Phys.
Rev. B 8, 1698 (1973).
14:45
BG4
New defect-associated absorption peaks in the
infra-red in SrTiO
J.L. BREBNER*, Y. LEPINE*,
S. JANDL** - Previous work on the 165 meV absorption
peak in SrTiO has shown that the absorption is due to
a localised electronic state and one phonon replicas of
the peak have been observed on the high energy side. In
this communication we present evidence for the existence
of additional peaks on the high energy side which are
interpreted in terms of multiphouon replicas of the
165 meV peak involving LO phonons of frequences of 100,
60 and 20 meV. In addition a new absorption peak associated with the 0-H stretching mode arising from Hydrogen in the crystal has been observed. The strong temperature dependence of this peak in the neighbourhood of
the phase transition at 110K has been studied. It is
concluded that this peak is associated with the softening of a zone centre TO phonon.
+
Subventionné par CRSNG et Ministère de l'Education
du Québec
*
Département de Physique, Université de Montréal
**
Département de Physique, Université de Sherbrooke
15:00
Break
15:15
BG5
Growth and Photoconductivity in Se1rTe
Alloys.
I. SHIH and C.H. CHAMPNESS, Dept. of Elec. Eng., McGill
University, Montreal.- Experiments are described in the
growth of crystals from melts-of composition Se Te
using the Czochralski method. For compositions with
x > 0 . 1 5 considerable difficulties were encountered, due
mostly to the fact that a proper liquid meniscus could
not be maintained between the seed and the melt. This is
believed to be due to the accumulation of a Se-rich
alloy layer at the solid-liquid interface, arising from
rejection of selenium from the freezing action. Addition
of thallium to reduce the viscosity of the melt did not
solve the problem. For melts with x < 0.15, ingots were
obtained in single crystal form with an actual composition x < 0 . 1 as determined by chemical analysis. From
samples chemically cut from these ingots, photoconductive
measurements were made in the infrared wavelength range
from 1 to 4.5 ym. At 100K, the photoconductive maximum
was shifted in wavelength from about 3.7 ym for pure Te
to 3.2 ym for an alloy of composition Se^
A corresponding shift of room temperature'conductivity
of 2 to 0.5 mho/cm was also found. Work on alloys with
a higher selenium content is being carried out and
will be reported on.
15:30
BG6
S p e c t r a l and T e m p e r a t u r e Dependence o f t h e
P h o t o v o l t a i c E f f e c t i n Cu 2 0-Cu J u n c t i o n s formed by High
T e m p e r a t u r e R e d u c t i o n * . A. A. BEREZIN and F. L . WEICHMAN,
U n i v . o f A l b e r t a - Measurements o f s p e c t r a l and
t e m p e r a t u r e dependence o f t h e p h o t o v o l t a i c (PV) e f f e c t
a r e r e p o r t e d f o r Cu 2 0-Cu j u n c t i o n s formed by h i g h
temperature r e d u c t i o n o f the surface o f the cuprous
oxide.
The d a t a o b t a i n e d a r e c o r r e l a t e d w i t h d i f f e r e n t
types o f a b s o r p t i o n spectra f o r the corresponding bulk
Cu20.
I n some d o u b l y a n n e a l e d Cu 2 0-Cu j u n c t i o n s a PV
a c t i v e a b s o r p t i o n e x i s t s i n t h e hv r e g i o n c l o s e t o t h e
v a l e n c e band.
Some e s t i m a t e s o f t h e PV p e r f o r m a n c e o f
o u r j u n c t i o n s used as S o l a r C e l l s a r e a l s o g i v e n .
We
c o n c l u d e t h a t t h e p r o p e r a n n e a l i n g sequence o f CU2O
can s u b s t a n t i a l l y enhance t h e m o n o c h r o m a t i c c o n v e r s i o n
e f f i c i e n c y o f t h e Cu 2 0-Cu c e l l s i n t h e i n c i d e n t p h o t o n s
e n e r g y r a n g e between 1 . 6 and 1 . 9 e v .
* S u p p o r t e d by t h e A l b e r t a - C a n a d a
R e s e a r c h Fund.
Energy
Resources
18
15:45
BG7
Interband Transitions of Semiconductors from
Photoelectrolysis Spectra. F.P. KOFFYBERG, Brock
University, St. Catharines, Ont. - The quantum
efficiency n of the photo-electrolytic splitting of
water into Hydrogen and Oxygen on semiconductor
electrodes has been investigated for a number of n-type
semiconducting oxides. Under certain well-defined
conditions^ n is proportional to the optical absorption
coefficient a(hv) of the semiconductor. Therefore an
analysis of the n(hv) spectra can provide both the
energy and the type (direct or indirect) of the lowest
bandgap and of higher interband transitions. Data
obtained by this method for a number of transition
metal oxides and ternary Cadmium oxides will be
presented.
Si.A. Butler, J. Appl. Phys. 48, 1914 (1977).
16:00
.BG8
Photoconductivity in Undoped Tellurium. N.G.
SHYAMPRASAD, C.H. CHAMPNESS and I. SHIR, Dept. of Elec.
Eng., McGill University, Montreal.- Photoconductive infrared response is being investigated in bulk monocrystalline tellurium at 77K between 1 and 4.5 pm wavelength.
Results on non-abrasively cut bulk samples confirm that,
on the short wavelength side of the maximum photoconductivity, the fall-off is greater for E-Lc than E//c.
Subsidiary maxima were observed in this region but no
evidence was found to indicate that these were due to
a damaged layer; etching raised the photoconductivity
but did not remove the undulations. Preliminary estimates of the surface recombination rates gave values
between 1,000 and 5,000 cm/sec. Lifetimes were also
measured and will be correlated with the photoconductivity results. The responsivity was found to increase with
decrease of sample thickness. Some preliminary measurements were also made to explain the thickness dependence
and to estimate the optimum thickness for maximum
responsivity.
MONDAY, JUNE 16, 1980
TIME
ROOM
16:15
BS B103
16:15
16:00
16:00
ANNUAL BUSINESS MEETINGS
CHAIRMAN
Division of Atomic & Molecular Physics
D. Poll
BS 108
Division of Condensed Matter Physics
M. Collins
SS 271
Division of Optical Physics
F. Rheault
SS 165
Division of Particle Physics
D. Measday
MONDAY, JUNE 16, 1980
ROOM BURKE SCIENCE AUDITORIUM
Chairman: C.C. Costain
ACHIEVING THE GOAL FOR R & D
20:00
BH1
& D Costs - A Public or Private Responsibility
André, M.P. CalgaAy CentAe
Achieving the goal of 2.5% of G.N.P. for R & D will require a reallocation of resources within the
Canadian economy which only the Federal Government can cause. This can be done directly through
government spending and/or indirectly through tax incentives, crown corporations or other programs.
Both methods have advantages and disadvantages and both require a political will which heretofore
has been lacking.
BH2
The Relationship between University Research and Development and the Socio-Economic
Stability of Canada
J. Fraser Mustard, Vian, faculty of Health Sciences, McMaiteA UnlueAiity
BH3
National Initiatives for Increased Research and Development
Technology Companies
A.R. Crawford, Pieé-ident,
A n a t e k Blecttonlci
Ltd.
Their Impact on Small High
19
TUESDAY, JUNE 17, 1980
ROOM SS 163
Chairman: E. Fawcett
9:00
CA1
Effect of Ordering on Mono- and Divacancy
Formation in 8-Brass Observed by Positron Annihilation.
S.M. KIM and W.J.L. BUYERS, A.E.C.L., Chalk River.-Measurements of the trapping of positrons in B-brass
have shown that the vacancy formation energy dramatically increases with the ordering of the alloy below the
order-disorder transition temperature. Based on predictions from our trapping model analysis of the monovacancy behavior, we have searched for, and found above
430°C, direct evidence for the cusp-shaped rise in the
trapping of positrons by divacancies that is characteristic of the rapid growth in the thermal divacancy
population as the order parameter goes to zero.
9:15
CA2
Vacancies in 3' Brass and (a + 3') Brass from
Positron Measurements. I. K. MacKENZIE and P. J.
SCHULTZ, Univ. of Guelph - The short diffusion length
of thermalized positrons permits the observation of the
growing vacancy population in different temperature
intervals for each component of the mixed-phase system.
Values are then obtained for the vacancy formation
energy for both the fee and bcc components for Zn
concentrations up to 48%. Lifetime measurements will
be reported for B' brass to supplement the recent
observation by Buyers and Kim (private communication)
of divacancy generation in angular correlation.
9:30
CA3
Effect of the hcp-<->fcc Phase Transition on
Positron Annihilation in Cobalt.* J. L. CAMPBELL
and C. W. SCHULTE, Dept. of Physics, U. of Guelph
and P. C. LICHTENBERGER, Dept. of Materials Science,
McMaster U - Recent angular correlation measurements1
show a discontinuity in the CCR as a function of
temperature at structural phase transitions in cobalt
and uranium; these occur at temperatures where
positron trapping by equilibrium vacancies is
negligible. We report lineshape measurements on
cobalt, which indicate that the discontinuity here is
caused by generation of dislocations at the phase
transition rather than by a phase-dependence of the
annihilation parameters.
*J. Winter, H. Matter and W. Triftshauser. Proc. 5th
Int. Conf. Positron Annihilation (Japan, 1979).
* Supported by NSERC.
9:45
CA4
The Fermi Surfaces and the Electron-Impurity
Scattering of Dilute Cu(Rh),Cu(Pd),Cu(Ir) and Cu(Pt)
Alloys. T.T0Y0DA, P.T.COLERIDGE and I.M.TEMPLETON,
National Research Council of Canada - In order to get
information about the electronic structure of isolated
second(4d) and third series(5d) transition metal atoms
dissolved in noble metals, the Fermi surface changes
and the electron-impurity scattering in alloys of
copper with a few hundred ppm of Rh,Pd,Ir and Pt have
been measured using the dHvA effect. For five extremal
areas of the copper Fermi surface, the changes in
area and the Dingle temperatures have been analyzed
using Fourier expansions and phase shift parametrizations. The experimental impurity resistivity is
compared with that calculated from the phase shift
parametrization. Compared with the case of 3d impurities in noble metals, the results are characterized
by larger s-phase shifts and smaller d-phase shifts.
METALS
10:00
CA5
Reduction of Magnetic Interaction in the
de Haas - van Alphen Effect.* A.J. VAN SCHYNDEL and
A.V. GOLD, University of British Columbia - Analysis of
the waveform of the quantum oscillations M in the
magnetization of metals, for example to obtain values
of the splitting factors g c for cyclotron orbits, are
often complicated by severe harmonic distortion due tothe magnetic-interaction effect. This complication
arises from the fact that M is determined by the total
induction B, which in turn depends on M itself,
requiring self-consistent calculations which are not
always conclusive. In a practical method for significantly reducing the magnetic interaction we simply add
to the applied field H a feedback field which is
proportional to M, and of opposite sign. The optimum
amount of negative feedback can be ascertained by
minimizing the sidebands which result from magnetic
interaction between genuine dHvA frequencies. We
report on a particular application to the determination
of g c factors for Pb.
*Supported by Natural Sciences & Engineering Research
Council
10:15
CA6
Open Orbits and Magnetoresistance of Hg^rAsFfj.
R.J. DINSER and W.R. DATARS, McMaster University* Induced torque measurements of Hg^_^AsF5 have shown a
primary open orbit and other open orbits due to magnetic
breakdown in low order reciprocal lattice directions of
the tetragonal lattice. This is in accord with a model
of the Fermi surface consisting of interacting one
dimensional bands. Chakraborty ert aJ. have measured
magnetoresistance-'- and the results are not in agreement
'•./ith this model. We analyse their technique in terms of
a conductivity tensor and show that at high fields the
Hall term enters their measurements. This resolves the
difficulty: the Fermi surface model is sufficient to
explain their results.
"""Chakraborty et al. , Phys. Rev. Lett., j+3, 1832 (1979).
*Research supported by NSERC.
10:30
Break
10:45
CA7
The Longitudinal Thermal Magnetoresistivity of
Potassium and the Linear Magnetoresistance Problem.
R. FLETCHER, Physics Dept., Queen's, Kingston. - If
inhomogeneities are responsible for the linear electrical magnetoresistance in uncompensated metals, then the
presence of the lattice conductivity Ag should suppress
the linear term in the thermal magnetoresistivity of K
above a characteristic field B ^ (m/ex)(X0/A
where
Àq is the zero field thermal conductivity and x the relaxation time. We present data exhibiting this effect,
thus adding support for the inhomogeneity theories and
reinforcing the view that potassium is a simple metal.
11:00
CA8
U n i a x i a l S t r e s s D e p e n d e n c e of t h e F e r m i
S u r f a c e of C o p p e r * . P . W . R U E S I N K and J . M . P E R Z ,
Dept. of Physics, University of Toronto - From
s i m u l t a n e o u s m e a s u r e m e n t s o f t h e a m p l i t u d e s of
q u a n t u m o s c i l l a t i o n s in m a g n e t o s t r i c t i o n a n d
torque in a single crystal of copper, w e have
d e d u c e d v a l u e s for the l o g a r i t h m i c s t r e s s
d e r i v a t i v e s o f m o s t e x t r e m a l c r o s s - s e c t i o n s of
t h e F e r m i s u r f a c e h a v i n g n o r m a l s in t h e (110)
plane.
R e s u l t s o f o n g o i n g w o r k in o t h e r p l a n e s
a n d of s o u n d v e l o c i t y m e a s u r e m e n t s o f s t r a i n
derivatives, will also be presented.
*Supported
by
NSERC
20
11:15
CA9 Pressure Dependence of the de Haas-van Alphen
Effect in Sodium". M. ELLIOTT and W.R. DATARS. McMaster
University - The pressure dependence of the de Haas-van
Alphen (dHvA) effect in single crystals of sodium has
been measured with pressures of up to 1».5 kbaj. Results
broadly similar to previous work in potassium have been
found. In particular, the rate of change of dHvA
frequency with pressure is approximately 15? lower than
that predicted on the basis of a free electron scaling
model. Possible causes of this anomalous behaviour are
discussed
^Z. Altounian and W.R. Datars, Can. J. Physics 5fi, 370
(1980).
11:45
CA11
Structure and Electron Density of States of
Liquid Binary Alloys.* S.K. Lai and S. Wang, U. of
Waterloo - The pseudopotential theory, developed ^
previously for the binary alloys of simple metals , Is
applied to calculate the partial packing densities and
electron density of states for the Li- and TH-based
liquid alloys. It appears that the charge transfer
affects significantly the quantities calculated. As the
charge transfer increases, the alloy density of states
shifts towards that of the non-electronegative component
of the alloy in such a manner that the on-Fermi-level
density of states tends to be smaller for the binary
alloy than for both pure metals making up the alloy. In
addition, the corresponding density of states effective
mass at the Fermi level is dlscuss€:d.
•Research supported by NSERC.
11:30
CA10
Magnetic Interactions in Dilute Metallic Alloys,
Crystalline and Amorphous? R.W. COCHRANE, U. de Montréal . - In this paper we discuss the magnetization of
several Gd alloy systems, focusing on the approach to
saturation at high fields and low temperature. For
crystalline alloys the theory of Larkin and Khmel'nltskii* describes the behaviour in the limit T = 0 giving
exchange constants consistent with other measurements.
A simple observation permits us to extend the analysis
to the region T > 0 and correspondingly lends support
to their approach. For dilute amorphous alloys the
behaviour in this regime is nearly identical to that
found for the crystalline alloys - even to the magnitude of the exchange constants. Hence we pass from a
domain in which the electronic mean free path is greater
than the inter-impurity separation to one in which these
parameters are reversed with little apparent effect on
the magnetic interactions. This result is surprising
in view of the fact that the RKKY coupling of magnetic
ions to conduction electrons is expected to be cut off
for short electronic mean free paths.
1
A.I. Larkin and D.E. Khmel'nitskii, Sov. Phys. JETP 31,
958 (1970)
* Supported by NSERC and le Ministère de l'Education du
Québec
Sjang S., Lai S.K. and So C.B., J. of Phys: Metal Phys.
10, 445(1980).
—
*
Supported in part by NSERC.
12:00
CA12
Electronic Transport in Li- and TH-Basec Liquid
Binary Alloys.* S. Wang and S.K. Lai, U. of Waterloo The pseudopotential theory, developed previously for the
binary alloys of simple metalsl, la applied to calculate
(i) the excess electronic charges on an electronegative
ion and (ii) the transport coefficients for the Li- and
TJl-based liquid alloys. It is found that a significant
fraction of the valence electrons is localized on an
electronegative ion for the alloys considered. Then the
relation between the electrical resistivity and the
charges localized on an electronegative ion is discussed.
Sfang S., Lai S.K. and So C.B., J. of Phys: Metal Fhys.
10, 445(1980).
*
Supported in part by NSERC.
21
TUESDAY, JUNE 1 7 , 1980
ROOM BS 108
Chairman: A.M. Robinson
9:00
CB1
LINEAR PLASMA CONFINEMENT, SHOCKS AND DIAGNOSTICS:
FUNDAMENTAL PROCESSES IN PLASMAS
Axial Confinement of Linear Magnetic Fusion Devices
Boye Ahlborn, UnivtUlty o( BtiXiih Columbia
Linear Mangenetic Fusion (LMF) devices such as 6-pinches, high voltage Z- pinches, reversed field
pinches, imploding liners or laser solenoids are systems which utilize densities and confinement
times in between the high density short lived laser plasmas and the low density long duration
tokamak plasmas. Due to the axial symmetry these devices have potentially significant advantages
for power generation since they provide better access for removal of heat and maintainance or
repair, and could possibly even be considered for continuous operation. Confinement of the plasma
in radial direction is achieved by strong magnetic fields. Confinement in axial direction may
be enhanced by mirror fields, magnetic cusps, RF fields and electrostatic confinement, plasma
guns or material plugs. The principles of these end and loss reduction schemes will be surveyed
and recent results on particle and energy confinement with gaseous plugs will be discussed.
9:45
CB2
Plasma Reaction Measurements made under conditions of Incompletely Developed flows in low pressure
shock tubes.* A.J. CUNNINGHAM, Physics Program, University of Texas at Dallas, Richardson, Texas; G.L. OGRAM,
Dept. of Chemistry, University of Toronto; JEN-SHIH CHANG
Dept. Eng. Physics, McMaster University; R.M. HOBSON,
Dept. of Physics & C.R.E.S.S., York University, Toronto
- Frequently, measurements of the time dependent reactions in a plasma at low pressures, must be conducted at
relatively high gas temperatures which can be readily
obtained under shock wave conditions. The flow in low
pressure, pressure-driven shock tubes has thus been
experimentally investigated for shock Mach numbers
1.6 £ 6 in the case of partially developed flows of test
gases at initial pressures of a few Torr. The results
taken over many years and also more recently, indicate
strong experimental support that the relatively straightforward analysis of the flow non uniformity by Mirels 1 ,
can also be applied as a good approximation in the case
of incompletely (ie. non asymptotically) developed flows.
10:30
CB5
The Effects of Electron Temperature Variation
and Metastable Atom Ionization on the Electron Density
Distribution in a Coaxial Diffusion Plasma Column for
Determination of Volume Recombination Coefficient. M.
KAMITSUMA* Y. ICHIKAWA, K. HASHIMOTO, S. TEII**
Dept. Elect. Eng., Musashi Inst. Tech., Tokyo. Japan. The volume recombination coefficient may be determined
using the coaxial diffusion plasma column by comparing
the measured distribution of electron density N e with
that of theoretically calculated has been proposed by
Chen et.al)>2 We present here an improved calculation of
the spatial N e distribution by taking into account the
effects of the electron temperature T e and the ionization
due to metastable atoms in the discharge tube. The
results show that (l) The spatial variation of T e becomes
pronounced when T e >l eV. (2) The ionization by
metastable atoms is small and can be neglected. Numerical
results for helium and neon gases are presented and
discussed. Some experimental data are also given for
comparison.
'Mirels, H. Phys. Fluids 9, 1907 (1966)
•'"Chen S.L.and Kamitsuma M. ,Rev. Sci . Instrum. U8.,26l (1977).
2
Chang J.S.,Kamitsuma M.and Chen S.L.,J.Phys.D,12, k09
(1979).
* Present address : CRESS, York University, Ontario, Canada
**Former name:Sin-Li Chen.
*Partially supported by NSERC (RMH, GLO and JSC) and by
Univ. of Texas Organized Research Funds (4JC)
10:00
CB3
Electrode Ablation in the Presence of Surface
Oxides*. K. DIM3FF, A.K. VIJH and P. ANTOINE, INRSEnergie, Université du Quebec and IREQ - The relative
sequence of characteristic times in which a coaxial
spark discharge is infused by material from electrodes
of differing metallic composition is difficult to explain in terms of heat transfer to a pure metal. However, spectroscopically observed electrode ablation times correlate well with known oxide properties of the
corresponding metal. This is particularly true for the
oxide electrical conductivity. An analytical treatment is thereby proposed, which can account for the primary stage of electrode arc erosion in the presence of
oxide layers on the electrode surface.
* Supported by N.S.E.R.C. et par le D.G.E.S. du Ministère de 1'Education du Québec
10:15
CB4
The Detection of Metallic Impurities bv laser
Fluorescence Spectroscopy*. B. LEBLANC and B.L.
STANSFIELD, INRS-Energie. Université du Québec, C.P.
1020, Varennes, Québec, JOL 2P0 - Measurements of the
spatial distribution of metallic impurities are important for the calculation of their transport in Tokamak
plasmas. One of the most promising techniques for the
detection of atoms with good spatial resolution is that
of laser induced fluorescence, which can allow atomic
densities of 10 6 cm - 3 to be measured. This is well below the densities near the walls in Tokamaks. The pumping source in our experiment consists of a flashlamppumped by laser in an unstable resonator configuration.
Results of the detection of iron atoms by laser fluorescence will be presented, using a hollow cathode
lamp as the source of iron atoms.
* Supported by Natural Science and Engineering Council
Canada.
10:45
CB6
Heat T r a n s f e r on a Conducting Dust i n a Flowing
r n l l i s i n r T T p s s Plasma. R. GODARD. Dept. Mathematics.
Royal M i l i t a r y C o l l e g e , and JEN-SHIH CHANG, Dept. Engin e e r i n g P h y s i c s , McMaster U n i v e r s i t y . - An understandi n g o f heat t r a n s f e r on a c o n d u c t i n g d u s t i n a f l o w i n g
c o l 1 i s i o n l e s s plasma i s i m p o r t a n t f o r dust p a r t i c l e obl a t i o n i n n u c l e a r f u s i o n a p p a r a t u s , vacuum a r c and c u r r e n t crowber s w i t c h , o r f o r u l t r a - f i n e p a r t i c l e s (10" 2 urr)
i n the e l e c t r o s t a t i c p r e c i p i t a t o r and o t h e r i n d u s t r i a l
process.
A c a l c u l a t i o n o f heat t r a n s f e r on a s p h e r i c a l ,
s p h e r o i d a l and c y l i n d r i c a l shaped c o n d u c t i n g d u s t i n a
col 1 i s i o n l e s s plasma has been done f o r o r b i t - m o t i o n l i m i t e d c o n d i t i o n s (Debye l e n g t h s u f f i c i e n t l y l a r g e ) , f o r
i o n speed r a t i o s S=U/<v> from 0 t o 7, and f o r nondimens i o n a l dust s u r f a c e p o t e n t i a l X p = e z N „ / k T from o t o i 50,
where <v> i s the most p r o b a b l e v e l o c i t y o f i o n , U i s the
d r i f t v e l o c i t y , K i s Boltzmann's c o n s t a n t , T i s temperat u r e , e i s the e l e c t r i c charge and Np i s the number o f
net charge a t s u r f a c e o f d u s t p a r t i c l e s .
The numerical
r e s u l t s show t h a t (1) f o r sphere a t a t t r a c t i n g potent i a l s X p < 0 , the heat f l u x has a non-monotomic dependence t o the speed r a t i o ; (2) f o r r e t a r d i n g p o t e n t i a l s
Xp>0, the heat f l u x decreases w i t h i n c r e a s i n g X p .
Howe v e r , the dependence o f heat f l u x on p o t e n t i a l i s nonexpo t e n t i a l .
22
ACCELERATOR PROJECTS IN CANADA
TUESDAY, JUNE 17, 1980
ROOM BS B103
Chairman: G.T. Ewan
9:00
CCI
"CANUCK" Kaon Factory: Physics Potential and Machine Design
M.K. Craddock, UrUveAilty of BAitiih Columbia
Beams of kaons and antiprotons 100 - 1,000 times more intense than those at present available could be
produced using the TRIUMF 0.5 GeV cyclotron as a high intensity injector to higher energy accelerators
(8 - 10 GeV for K's, 25 - 30 GeV for p's). Such beams would make possible the accurate exploration of
several fields where present information is sketchy but rich in potential--kaonic and hyperonic decay
processes, K- and p-nucleon interactions and resonance spectra, kaon-nucleus scattering, A- and Z- hypernuclei, exotic atoms and K° regeneration.
Intense beams of other particles would also be available—
protons, neutrons, pions, muons and both muon- and electron-neutrinos. Two alternative accelerator
designs are described. One, "CANUCK", consists of 3 GeV and 8 GeV isochronous ring cyclotrons, each
stage being capable of accelerating the 400 yA currents which could eventually be available from TRIUMF.
The other is based on two proton synchrotrons, the first fast-cycling, accelerating 30 - 80 pA to 10 GeV,
the second superconducting, taking 30 pA to 30 GeV.
9:35
CC2
The e-p Collider
R.J. Hemingway, The Institute
of PaAtlcZe
PhyilcM
In the last decade we have seen tremendous advances in our understanding of the basic forces of nature.
The 1979 Nobel Prize for Physics was awarded to Glashow, Salam and Weinberg for the development of the
theory which unifies the electromagnetic and weak forces. A new theory of the strong interaction is
beginning to emerge - Quantum Chromodynamics (QCD). The real testing ground of these new theories,
and their impact on our ideas of Grand Unification, will surely be the particle accelerator facilities
of the next decade. Colliding beams offer the possibility of reaching kinematic regions far beyond
those accessible to fixed target experiments.
The Institute of Particle Physics proposes to study
E-P collisions by building a 10 Gev/c electron/-positron storage ring at a tangent to the Tevatron
superconducting proton ring at Fermilab. With the construction of a complex detector we will have a
unique opportunity to play a leading role in the elucidation of the electro-weak theory and of QCD.
10:10
Break
10:25
CC3
The Chalk River Superconducting Heavy-ion Cyclotron
J. Ormrod, Atomic EneAgy of Canada Limited
The Chalk River K - 520, 4-sector, superconducting cyclotron is designed to accelerate all ions from
Li (to 50 MeV/u) to U (to 10 MeV/u) using a 13 MeV tandem Van de Graaff as injector. The cyclotron's
5 Tesla magnet and 100 kV radio-frequency accelerating system have been separately tested; integrated
tests are scheduled for late this summer. Results of these tests will be given, anticipated output
beam properties will be described and comparisons made with other heavy-ion accelerators.
11:00
CC4
The Montreal Electron Project
P.H. Depommier, UnlveAiltë de
UontAéal
A group of physicists from the Université de Montréal has initiated a feasibility study for a modern
electron accelerator facility. The group intends to define some of the problems of current and of
future interest in physics which can be tackled with the coming generation of electron machines.
Simultaneously, the parameters of an accelerator capable of solving such problems are under study:
energy of the order of 1 GeV, 100? (or close to 100$) duty cycle, beam intensity in excess of 10
microamperes.
The instrumentation needed to equip the experimental areas (spectrometers, etc...)
is also considered.
The status of our study is presented in this paper.
11:35
CC5
MARIA—Medical Accelerator Research Institute of Alberta
D.M. Sheppard, UnlveAilty of AlbeAta
A major medical research institute proposed for the University of Alberta has been designed around
two cyclotrons and a synchrotron. The facility would produce variable energy beams (to 550 MeV/anu)
from hydrogen to neon. The proposal includes radiation treatment facilities with multiple beam
capabilities, a diagnostic facility for radiography and positron imaging, and separate facilities
for radiochemistry, high energy physics, biology, pharmacology, and chemistry.
23
TUESDAY, JUNE 17, 1980
ROOM SS 102
Chairman: G. Atkinson
9:00
CD1
AERONOMY AND SPACE PHYSICS
Some New Developments in Space Science in Canada
I.B. McDiarmid, National Reseanch Council of Canada
9:30
CD2
A Campaign to Study Pulsating Auroras
D.J. McEwen, UnlveAi-ity of Saskatchewan
D u r i n g J a n u a r y a n d F e b r u a r y of 19 80 a c a m p a i g n i n v o l v i n g s o m e 25 C a n a d i a n a n d
J a p a n e s e a e r o n o m e r s a n d s p a c e sci e n t i s t s w a s u n d e r t a k e n f r o m a c h a i n of s t a t i o n s
in northern Saskatchewan to investigate the processes involved in pulsating
auroras.
S o m e of t h e r e s u l t s of t h e c a m p a i g n , w h i c h i n v o l v e d g r o u n d p h o t o m e t r i c ,
a u r o r a l T V and r a d i o m e a s u r e m e n t s d u r i n g t h e 3 2 n i g h t s of o p e r a t i o n s , t w o r o c k e t
Of particular
f l i g h t s a n d o v e r - p a s s e s of s e v e r a 1 s a t e l l i t e s , w i l l b e h i g h l i g h t e d .
n o t e w e r e the two Black B r a n t g u id a n c e - c o n t r o l l e d r o c k e t s w h i c h w e r e f l o w n i n t o
p u l s a t i n g a u r o r a s o n t h e m o r n i n g s of F e b r u a r y 15 a n d 23 to a p o g e e s of 156 and 148
km respectively.
T h e y m o n i t o r e d i n c o m i n g e l e c t r o n f l u x e s d u r i n g s e v e r a l c y c l e s of
p u l s a t i o n s of t h e a u r o r a l p l a s m a a n d p r o v i d e v a l u a b l e c l u e s as to t h e m e c h a n i s m
producing auroral pulsations.
10:15
Break
10:30
CD 3
Current Trends in Space Plasma Research
B.A. Whalen, National Research Council of Canada
Observations of the near-earth space plasma over the last twenty years has produced a reasonably
complete picture of the diverse plasma regions existing within the earth's magnetosphere. Efforts
are now being concentrated on understanding the physical processes occurring within this dilute
magnetized plasma which cause a variety of interesting phenomena, many of which are of cosmological as well as of geophysical interest. Experiments are presently in progress or are planned for
the near future which use the magnetosphere as an unbounded plasma laboratory. A number of active
perturbation, simulation and tracer experiments are reviewed and some future programs are discussed.
11:15
CD4
Project Waterhole: An Auroral Ionospheric Perturbation Experiment. A.W. YAU, B.A. WHALEN, Herzberg
Inst, of Astrophvs., National Research Council Canada, G.
SMITH and M.B. PONGRATZ, Los Alamos Scientific Lab. - In
a joint effort of the National Research Council of Canada
and Los Alamos Scientific Laboratory, 100 kg of high explosives were carried on board a Nike Black Brant rocket
payload, and released at an altitude of 300 km above a
pre-midnight auroral arc at Fort Churchill, Canada. The
water molecules - the major by-product - in the release
charge-exchange with the 0 + plasma in the auroral ionosphere to yield molecular ions. The subsequent dissociative recombination of the molecular ions with the ambient
electrons results in an order-of-magnitude depletion in
plasma density, i.e., the formation of an ionospheric
"hole", in the auroral flux tubes. The perturbation to
the auroral ionosphere by the release was used as a tool
with which to probe the acceleration mechanism of the
auroral particles: comprehensive in situ electric/magnetic field, current, particle and photometric measurements
were coupled with ground-based observations and theoretical modelling to explore the aeronomy of the perturbed
ionosphere and the electrodynamics of the auroral response.
11:30
CD5 Differential phase total electron contact
measurements during "Waterhole". P.A. FORSYTH,
J.A. FULFORD, J. HOFSTEE, G.F. LYON, J.W. MACDOUGALL,
Centre for Radio Science, University of Western Ontario.
A transmitter package radiating at frequencies of 108
and 324 MHz was ejected from the rocket. Differential
phase measurements were made at two separated locations
on the ground. The results are described.
11:45
CD6
;Long-line' E l e c t r i c Field Measurements.
J.W.
MacDougal 1, Centre f o r Radio Science, Univ. of Western
Ontario - Measurements of the ionospheric e l e c t r i c
f i e l d usi ng the ' l o n g - l i n e ' technique are now done on a
quasi rou t i n e basis from London, Ontario. The 'longl i n e ' u t i lizes the movement of the s c i n t i l l a t i o n
patterns from geostationary s a t e l l i t e s , as observed on
an array of receivers, to observe the E X B ionospheric
Sample
results from t h i s program w i l l be
drift,
discussed
12:00
CD7
Enhanced Twilight Lithium Emissions alter
Project CAMEO.*
H.M. SULLIVAN; University of
Victoria - Employing a birefringent filter photometer
enhanced twilight lithium emissions were observed at
Victoria, B.C., 77 hours after the release of 2.2 kg of
lithium vapour on November 6, 1979, from Nimbus 7
satellite during project CAMEO, the release having
taken place over Scandinavia at a height of 961 km.
Although the emissions were not as bright as those
observed on previous occasions 1 , the maximum intensity
was measured to be 50 rayleighs after which it decreased
steadily at a rate of about 5 rayleighs per day for
about 5 days returning to values usually found in late
autumn. The height of the twilight emission was found
to be about 90 km, in agreement with values previously
obtained for naturally occurring emissions.
'Sullivan, H.M. , Ann. Geophys., 32, 407 (1976)
•Supported by NSERC and the University of Victoria
24
TUESDAY, JUNE 17, 1980
ROOM SS 270
Chairman: J . R . Stevens
9:00
CEI
PHYSICS EDUCATION
Problem Solving Techniques in Physics
D.R. woods, Department o( Chemical Engineering, McMaiteA. UniveAiity
Difficulties students have in solving problems - especially physics problems - will be surveyed.
Suggestions will be given about how to improve the teaching of problem solving skills - by means
of the Lochhead Whimbey pair method, through the everybody share tutorial technique, through
written material such as the HELP (P) material. Resources available will be described.
9:45
CE2
Analysis of a University Advisory Entrance Exam
in Physics. D. AUSTEN and W. BROUWER, Department of
Physics, University of Alberta - A Physics Advisory
Exam has been constructed to examine student readiness
for university physics in the areas of General Reasoning, Mathematics, Laboratory Skills, Mechanics,
Electricity and Magnetism and Modern Physics. The
General Reasoning Items relate to activities designed
to test Formal Operational Thinking Ability of students
taking a first-year physics course. The results of
the examination have been analyzed with respect to
urban-rural differences, sex differences, different
high school physics courses, etc. Subscores on the
exam have also been correlated with final marks in
different first year physics courses to assess the
predictive power of the advisory exam.
TUESDAY, JUNE 17, 1980
ROOM SS 271
Chairman: C. D e l l s l e
9:00
CF1
10:00
CE3
An Evaluation of a First Year University
Physics Course. D. AUSTEN and W. BROUWER, Department
of Physics, University of Alberta - The authors
evaluate the effectiveness of a university physics
course designed for students who have not taken physics
in high school. Student scores In subsequent physics
courses are compared for students who have taken high
school physics and those who have taken the university
"make up" course. The authors found that the university physics course does not completely make up the
physics deficiency of students who have not taken high
school physics.
OPTICAL PHYSICS I I :
LASER OPTICS, GUIDED WAVE OPTICS, HOLOGRAPHY
Optical Phase Conjugation
P.A. Bélanger, UniveASitC Laval
The energing subject of phase conjugate optics is receiving much attention at present. The basic
building block for phase conjugate optics is the phase conjugate mirror (PCM), an optical element
that has the unusual property of converting an incident optical wave into a reflected wive whose
complex phasor amplitude is the complex conjugate of the incident wave. A review of experimental
realization of such mirrors will be presented. Some applications already made or suggested will
also be discussed. A demonstration of phase conjugation with pseudo-PCM is planned.
9:45
10:00
CF2
Break
Fiber Optics at the Communications Research Centre
D.C. Johnson, K.O. Hill and B.S. Kawasaki, Department of Communlcationi
The fibre-optic research activities at the Communications Research Centre are described
with particular emphasis on recent work on the measurement of modal noise in fibre-optLc
systems, nonlinear effects in fibres and fibre-optic data buses. The significant results
of this work that will be reported are as follows. A theoretical model for the modal
noise in fibre-optic systems is described and its application to quantitative determination
of the modal noise in an optical fibre containing connectors is discussed. The efficient
frequency upconverslon in an optical fibre of infrared light into visible light is described and the use of hybrid transmission-reflection star couplers to construct data bus
networks is reported.
25
10:45
CF3
Multicolor Holographie Imaging in White Light.
C.P. GROVER and R. TREMBLAY, Dept. Physics - LROL, Univ.
Laval - We describe a new technique of making holograms
of multicolor subjects which reconstruct images in natural colors with a white light source. If a hologram is
recorded with the subject wave undergoing continuous
displacement in the vertical direction, it concentrates
all the diffraction light into a light distribution proportional to the sine function. When adjusted to disperse along the direction of the subject displacement the
hologram shows monochromatic images of the subject on
observation from the dispersed principal maximum of the
sine function. A multiplexed hologram of the color separations of the multicolor subject when recorded using
a fixed reference beam direction, disperses the sine
functions with their principal maxima coinciding only
for the wavelengths at which the constituent holograms
were recorded. Even with the low diffraction efficiency
of the multiplexed hologram, bright image reconstructions
are possible. The resolution in the reconstructed images
depends upon the subject displacements, the effective
bandwidth of the illuminating light and the hologram recording geometry. An analysis of the technique and some
experimental results are presented.
11:00
CF4
Development of High Efficiency Light Guides.*
L.A. WHITEHEAD, F.L. CURZON, R.A. NODWELL, Dept. of
Physics, U. of British Columbia - A description of our
light guide research program is presented. The
recently invented prism light 1 guide 1 consists of a
cylindrical pipe of rectangular cross section. The
acrylic plastic walls are grooved on their external
surfaces so as to cause total internal reflection of
light incident from the inside of the pipe. The high
reflectivity of the walls, in conjunction with the
low absorption in the air, results in a light guide of
high efficiency which can be used for piping light from
a central source for the purpose of illuminating rooms
in a large building. There are many circumstances where
explosion risk, waste heat considerations, or maintenance problems could make such an illumination system
desirable. The emphasis of the presentation will be
placed on the optical properties of the light guide wall
and general problems involving the optical design of a
"central lighting" system.
latent application has been filed by CPDL.
•Supported by the NSERC via a PRAI grant.
11:15
CF5
Calcul des constantes optiques d'un matériau
diélectrique à partir de mesures de transmission.
A. GIRARD et C. DELISLE, LROL, Département de Physique,
Université Laval - A partir de mesures de la transmittance à travers une série de films de différentes épaisseurs d'un matériau diélectrique faiblement absorbant,
on obtient le coefficient d'absorption dont on tire le
coefficient d'extinction. Des mesures de transmittance
on déduit également la réflectivité et par la suite
l'indice de réfraction. On décrit la méthode, ses particularités, ses avantages et ses inconvénients. A titre d'exemple, la méthode est appliquée au plexiglas, à
température ambiante, à 10.6ym.
TUESDAY, JUNE 17, 1980
ROOM SS 164
Chairman: B. Bergersen
9:00
CGI
The Pelerls transition In substitutional^
disordered quasi-lD conductors.* C. TANNOUS and A.
CAILLE, Département de physique, Université de Sherbrooke • In this work, the mean field transition temperature
of the Peierls transition is obtained for a quasi-onedimensional binary substitutional alloy A x B i _ x as a
function of the relative concentration x. The Peierls
state is assumed to result from a soft-mode structural
instability driven by the one-dimensional electronic
system coupled to the intramolecular vibrational mode.
We consider only diagonal disorder arising from fluctuations in the intrasite electron potential and electronintramolecular vibrational mode interaction. Its effect
on the Peierls phase is evaluated using the coherent potential approximation for single dimers. The use of
suitable approximations resulted in an analytic expression for the transition temperature.
* Supported by the National Research Council of Canada
and le Ministère de l'Education du Québec.
CONDENSED MATTER THEORY
CONTRIBUTED
9:15
CG2 The effects of fluctuations in one-dimensional
ant iferromagnet s. C. BOURBONNAIS and L.G. CARON, Université de Sherbrooke. A method to treat fluctuations
in one-dimensional antiferromagnets is developped and
tested. We know that this kind of system cannot undergo
a phase transition at non-zero temperature. However,
fluctuations effects are very important and are particularly apparent in magnetic susceptibility. Our treatment is to start with a functional integral representation of the partition function with the aid of the
Hubbard-Stratonovich transformation. The magnetic susceptibility is calculated in the approximation of generalized Ginsburg-Landau fields 1 . We have tested the validity of this approximation with an application to the
one-dimensional Ising model, in which the exact result
is well known. Many difficulties arise with the
Ginsburg-Landau treatment of fluctuations when compared
to the exact solution; this forces us to impose severe
limits in its range of validity.
^Scalapino, M.J., Sears, M. and Ferrell, K.A., Phys. Rev.
B6, 3409 (1972).
26
9:30
CG3
Coexistence of Antiferromagnetlsm and SpinPelerls Order* Y. LEPINE, Département de Physique, Université de Montréal - We Investigate the possibility of
coexistence of an antiferromagnetic order with a spin
Peierls distorsion at low temperature in an Heisenberg
antiferromagnetic quasi-one-dimensional chain. The
theory of Soos is used to treat the spins and to define
an order parameter corresponding to a long range antiferromagnetic order. The interaction between the ions
is described by an harmonic potential. We present a
phase diagram, corresponding to a mean field theory
treatment, that shows, in this context, that both types
of order cannot coexist. We also find, for certain
values of the lattice rigidity, that one can pass from
a uniform phase at high temperature to an antiferromagnetic phase and finally to a Peierls phase at low
temperature.
10:30
CG6
Surface Tension of a Liquid-Vapour Interface*.
M. GRANT and R. C. DESAI, Dept. of Physics, Univ. of
Toronto—We have recently derived a general statistical mechanical expression for the surface tension of a
simple fluid with an arbitrary many body interaction
potential. It reduces to the Kirkwood-Buff formula
for pair potentials. We shall present the extensions
of this treatment for (i) a quantum mechanical fluid,
(ii) a molecular fluid and (iii) a fluid in d-dimensions. We shall also give for (ii) and (iii) the
sum rules and use them to establish equivalent formulae that are analogous to the fluctuation formulae
of Yvon, Triezenberg and Zwanzlg as well as the correlation function expression of Jhon, Desai and
Dahler.
*Supported by NSERC of Canada.
l
M. Grant and R. C. Desai, J. Cheir. Phys. 72, 1482
(1980).
1
Soos, Z.G., J. Chem. Phys. 43, 1121 (1965).
*Supported by the Natural Sciences and Engineering
Research Council of Canada.
9:45
CG4 Hopping conduction by the r a d i a t i v e tunnel
t r a n s i t i o n s in semiconductors in a strong e l e c t r i c
f i e l d . A. A. BEREZIN, Univ. of Alberta - The theory of
the r a d i a t i v e tunnel t r a n s i t i o n s (RTT)1 of electrons
between trapping centers i n crystal l a t t i c e is applied
to the case of hopping conduction (HC) 1n the strong
e l e c t r i c f i e l d . This HC occurs by the successive
spontaneous RTT of electrons (holes) between the
localized states near the Fermi l e v e l . At each hop the
excess energy is emitted as a long-wavelength photon.
The conditions of the r e l i a b i l i t y of the model of HC by
RTT are: 1) low temperatures, 2) high density of
localized l e v e l s , 3) p a r t i a l compensation. The numerical estimations of the r e l a t i v e contribution of the HC
by RTT are made f o r : 1) heavily doped compensated
germanium and 2) beta-rhombohedral boron - the systems
with large and small e f f e c t i v e radius of the localized
states respectively.
'Berezin, A. A . , Phys. L e t t . , 72 A, 48 (1979).
10:45
CG7
Resolvent Formulat ion of Diagrammatic Perturbation
Theory at Finite Temperature*. N. GAUTHIER, Dept. of
Physics, Royal Military College of Canada, Kingston,
Ontario. Finite-temperature diagrammatic techniques (1)
are formulated in terms of the Schrodinger resolvent^'
for the first time. Thermal expectation values of
operators and correlation functions are simply related
to thermal resolvents and contact with conventional
approaches is made. The resolvent method proves simple
to use and to interpret physically. It permits to
formulate diagram techniques in first-quantized"'
language, a language which often appeals more to the
physical intuition than that of sescond-quantization"}
The case of a single spin coupled to the linear vibrations of a harmonic lattice is discussed as being a case
in point.
"'"Fetter, A.L. and Walecka, J.D., " Quantum Theory of
Many-Particle Systems", McGraw-Hill Book
Co., New York, N.Y. (1971).
2
Messiah, A., "Quantum Mechanics", North-Holland Publ.
Co., Amsterdam (1966).
10:00
CG5
Coherent Quantum Diffusion of Impurities within
a Single Band. T. McMULLEN, Dept. of Physics, Queen's
Univ. - The mobility of a single defect or impurity
within a coherent band is limited by nearly elastic
scattering of phonons from the defect. Consequently, in
the coherent diffusion regime the diffusion constant D
is not simply related to the time-of-stay t s - 1 by
T s - 1 » 6D/a 2 , where a is the jump distance. This produces a temperature dependence in experiments which
measure T s (e.g. pSR and other spin resonance experiments) which differs from that observed in those which
measure the diffusion constant or mobility. Results
which illustrate this difference will be presented for
coherent diffusion of an interstitial impurity in a
metal. A single band model with an unrenormalized bandwidth of ^ 10 meV is used, a bandwidth which is approximately that extracted from one interpretation") of experiments on H diffusion in Nb. The onset of coherent
diffusion in this model of a light interstitial in a
metal occurs at I i 10-100 K.
^Richter D. , Alefeld B. , Heidemann A. and Wakabayashi N. ,
J. Phys. F 6, 569 (1977).
10:15
Break
11:00
CG8
Ising Antiferromagnets near H=H r and T=0;
Results from Hard-Core Lattice Gas Calculations*
Zoltân Racz, Physics Dept•.McMaster Univ., Hamilton
Ising antiferromagnets in a near-critical magnetic
field at low temperatures are equivalent to hard-core
lattice gases. Using this connection and the existing
series expansion results for hard-core lattice gases, we
determine the slope of the phase boundary at T=0 for the
square, plane-triangular, simple cubic and body-centered
cubic antiferromagnets. Miiller-Hartmann and Zittarz's
postulate for the critical curve of the square Ising
antiferromagnet is also tested. A renormalization group
treatment of the hard-square lattice gas yields a critical activity z* = 3.7959±0.0001 which is in agreement
with series-expansion and finite-lattice estimates but
in variance with the postulated z* = 4. The same calculation gives V = 0.999±0.001 for the correlation
length exponent thus supporting the conjecture that the
transition of the hard-square lattice gas belongs to
the Ising universality class.
Supported by NSERC
27
11:15
CG9
A Quasiatom Model of Atoms in Nonuniform Electronic Systems.
M.J. STOTT and E. ZAREMBA, Dept. of
Physics, Queen's U., Kingston. - A method of estimating
the energy of an impurity atom in an arbitrary host
electronic system using density functional theory will
"be presented. Emphasis is on the "quasiatom" - the
neutral unit consisting of the impurity ion plus its
electronic screening cloud. The energy of the quasiatom is a functional of the unperturbed host electron
density in which it is immersed. In the simplest
approximation it is given by the energy of the impurity
in a uniform electron gas having a density equal to
that of the host at the position of the impurity nucleus. This uniform density approximation (UDA) is
tested for light atoms in a variety of model and realistic situations and successfully reproduces qualitative trends. Some tests of the UDA and host density
gradient corrections will be discussed.
*
Work supported by the NSERC of Canada.
11:30
CG10
Dynamics of the Crystallized One Component
Plasma. G.H. KEECH, AECL, Chalk River Nuclear
Laboratories, and H.R. GLYDE, U. of Ottawa. — The
dynamics and energy of the crystallized one component
plasma (OCP) (e.g. Wigner Crystal) is evaluated using
the self consistent phonon theory of lattice dynamics.
Melting of the crystal is also examined. The OCP
crystal is harmonic for particle RMS vibrational
amplitudes as large as 25% of the interparticle spacing.
This is due to the soft, (r~l) core of the Coulomb
potential. Anharmonic effects are, however, entirely
responsible for the eventual mechanical instability,
identified here with melting, of the crystal at large
enough RMS amplitudes. This takes place at r s = 180 at
T = 0 K for the most sophisticated SCP theory.
11:45
CG11
Transmission Electron Spin Resonance in Nearly
Ferromagnetic Metals. D. S. MONTGOMERY, University of
Toronto—Some features of the lineshapes found in Conduction Electron Spin Resonance experiments on metals
with a large quasiparticle exchange interaction, and
on metals with a highly anisotropic gyromagnetic ratio,
are analyzed theoretically using the Landau theory of
Fermi liquids. Results obtained by Monod 1 in CESR experiments on Palladium are discussed using a simple
model.
1
P. Monod, Journal de Physique C6, 1472 (1978).
12:00
CG12
Calculation of Second Virial Coefficients for
Nitrogen and Carbon Monoxide.* M.D. WHITMORE, Memorial
University of Newfoundland, and D.A. GOODINGS, McMaster
University - The classical second virial coefficients
B(T) for nitrogen and carbon monoxide have been calculated exactly as a function of temperature for three
different realistic models of the intermolecular potential. The potential models, due to Kohin, Raich and
Mills, and Raich and Gillis, differ mainly in the way
in which they represent the short-range Coulomb repulsion between molecules. As this interaction depends on
the molecules' shape, it is highly anisotropic. To ensure good accuracy in the results for B(T) the angular
and radial integrals were performed by suitable Gaussian
integration methods. The contributions to B(T) of
various anisotropic terms are considered, and a power
series expansion in terms of the anisotropic part of
the potential discussed. The calculated results are
compared with experiments and some general conclusions
are drawn.
Supported by the Natural Sciences and Engineering Research Council of Canada.
STRUCTURES
TUESDAY, JUNE 17, 1980
ROOM SS 165
Chairman: J.R. MacDonald
9:00
CHI
A Canadian Facility for Small Angle Neutron
Scattering Research.* J.R.D. COPLEY and J.A. MORRISON,
McMaster U. - Small angle neutron scattering (SANS) is
a valuable tool for the study of large scale particle
sizes and periodicities in matter.* It has recently
found wide application in such diverse fields as
biochemistry, polymer science, and materials research.
Until recently, the majority of SANS research has been
conducted in Europe; now, however, experiments are
being performed in the U.S. In March of this year,
NSERC approved funds to construct a SANS spectrometer
at the McMaster Nuclear Reactor, and detailed planning
for this project is currently underway. The facility
should be in operation by late 1982. Its main
features will be described.
9:15
CH2
Soft X-Ray Microscopy and Microchemical Analysis of
Biological Cells* W. FINDLAY, P.C. CHENG AND
J.WM. MCGOWAN, University of Western Ontario
The same technology that is used f o r the manufacture
of m i c r o c i r c u i t s has now been transferred to the study
of b i o l o g i c a l c e l l s . Soft x-ray lithography now makes
i t possible f o r us to examine unstained biological
materials with the minimum amount of r a d i a t i o n damage
to t h i s material. Also, i t appears that one can carry
out microchemical analysis of c e l l s with the resolution
approaching 5nm. The method has now been applied
successfully to a number of biological systems.
* Supported by MRC and NSERC
See, for example, the proceedings of the Fourth
International Conference on Small-Angle Scattering
of X-Rays and Neutrons, in J. Appl. Cryst. 11 ,(5)
295 ff. (1978).
•Supported by NSERC
28
10:45
CH7
X-ray Topography of Structure Modifications in
a-hl ? 0^*.H.H. Schloessin, Department of Geophysics,
Univ. of Western Ontario, London, Ont. Heating or
high pressure combined with heating of a-A^203 single
crystals containing H2O produces partial structure
modifications to S and 3"and mullite. Nucleus
formation probably involves various H-0, OH and H3O
bridges. Sets of traverse diffraction topographs
were obtained for different Bragg reflections of
ot-and 8- structures. Some anomalously high diffraction intensities are interprettecl as the result of
regularly spaced nuclei acting as diffraction gratings . The diffraction images of the imperfections
appear as clusters, planar defects and lineations.
Rocking curves of (230) and (702) - reflections produced with applied electric fields (at different
positions along the traverse) exhibit considerable
changes in peak intensity and position.
9:30
CH3
Two Dimensional NMR for Improved Resolution of
Heterogeneus System Response. H. PEEMOELLER, B. BHARAJ,
L.J. SCHREINER*, R.K. SHENOY and M.M. PINTAR, Department
of Physics. Univ. of Waterloo, Waterloo, Ontario N2L3G1.
Analysis of the nuclear magnetization recovery as a
function of the position in time along the free induction decay allows a heterogeneous system FID to be
resolved into components. This resolution is
conditional on the magnetization components having
relaxation times different by roughly a factor of 5.
Such multiwindow NMR requires an on-line computer. The
technique will be demonstrated on a known mixture of
two solids. Applications to liquid crystals, hard and
soft tissues will be presented.
9:45
CH4
Two Dimensional NMR Analysis of Freezing of a
Protein-Water System. H. PEEMOELLER*, R.K. SHENOY and
M.M. PINTAR, Department of Physics, Univ. of Waterloo—
D.W. KYDON, Department of Physics, University of
Winnipeg, Winnipeg, Manitoba. - In a study of water
freezing in HEW lysozyme - (natural and deuterated)
water systems by 2-D NMR the proton magnetization
component of the nonfreezable water was resolved. This
makes the accurate characterization of the coordination
shell water possible. The new results on nonfreezable
water will be compared to data obtained with standard
NMR techniques and dielectric studies.
10:00
CH5
The Structure of Nitrogen Gas.* J. D. SULLIVAN
and P. A. EGELSTAFF, Univ. of Guelph - The structure
factor for nitrogen gas has been measured1 over a range
of densities from 3 to 9 moles/liter and a range of
temperatures from 160K to 296K using the technique of
neutron scattering. It is found that it is possible to
get good results on the structure of the gas phase down
to 3 moles/liter. The results of these diffraction
experiments are compared to second virial calculations
using both isotropic and anisotropic interaction
potentials. Even though these potentials gave good
agreement with liquid data, significant discrepancies
are seen here.
«supported by Academic Development Fund, UWO.
11:00
CH8
The Structure of Agi6ll2P;i07. a Room Temperature Ionic Conductor^ R. FAGGIAN:, J.D. GARRETT,
S. CARBOTTE, I.D. BROWN, J.E. GREEDAN, Institute for
Materials Research, McMaster University, Hamilton,
Ontario, L8S 4M1 - The addition of P2O74- to Agi to
form the title compound increases its room temperature
ionic conductivity by more than 2 orders of magnitude
to 0.07 n-lcm-l.l In order to better understand the
origins of this conductivity we have grown single crystals by cooling a melt of composition 15.5% Ag4P2Û7,
84.5% Agi from 280°C to room temperature over 10 days.
The structure has been determined by x-ray diffraction.
The crystals are hexagonal P6/mcc a=12.048, c=7.461 X
pseudo isostructural with (C5H5NH)Agslg2 with a close
packed array of I atoms providing a matrix through
which the silver atoms can move. The partially occupied
silver atom sites were located with the aid of a valence
map3 which, in a modified form, dramatically reveals the
channels through which the silver atoms can move.
^ a y e r M., Corey J., Prasad E., Segel S.L., Heyding R.D.
and Boyle T. Private communication.
Geller S., and Owens B.B. J. Chem. Phys. 33 1241 (1972).
3
Waltersson K. Acta Cryst. A34 901 (1978).
2
•Supported by the Natural Science and Engineering
Research Council.
'Sullivan, J.D. and P.A. Egelstaff, Molec. Phys. 39,
329 (1980) for data at 296K and 200K and densities
of 8 and 6 moles/liter.
10:15
CH6
The State Dependence of the Structure of Liquid
Rubidium.
P. T. CUMMINGS and P. A. EGELSTAFF, Univ. of
Guelph - Comparison is made between new experimental
results on the structural properties of liquid rubidium
and results obtained from the exact solution of the mean
spherical approximation for the model liquid metal
potential introduced by Cummings1. The comparison is
made over twelve points in the phase diagram which allow
the temperature and density dependence of the data to be
investigated.
1
Cummings, P.T., J. Phys. F. 9, 1477 (1979).
11:15
CH9
Magnetic Structure of Bornlte, CucFeS^.*
M.F. COLLINS, McMaster U., G. LOSGWORTH, AERE, Harwell.
England and M.G. TOWNSEND, AERE, Harwell, England and
Energy, Mines and Resources, Ottawa - We have confirmed
by neutron powder diffraction techniques that crystal
structure of bornlte at low temperatures contains
sixteen cation sites, four of which contain vacancies,
ten copper atoms and two iron atoms. Below the
antiferromagnetic ordering temperature of 76±2K the
spins at the two iron sites become aligned in opposite
directions with an iron moment of 4.4±0.2Ug, Mossbauer
and neutron data suggest that the second magnetic phase
transition at 8K arises from a spin rotation. Since
the magnetic structure observed only gives
superexchange paths between iron atoms through two or
more anions, it is difficult to understand why the Neel
temperature is so high without invoking small moments
on copper atoms.
•Supported by NSERC
10:30
Break
29
11:3Q
CH1Û
Magnetic Structures of RTiO^; R=Tb,Ho,Er and Tm.
C.W. TURNER, M.F. COLLINS and J.E. GREEDAN, Inst. for
Materials Research and Departments of Chemistry and
Physics, McMaster Univ. - The magnetic structures of
these materials have been determined by neutron powder
diffraction. They all crystallize in orthorhombic distorted - perovskite structures. The
moments in
ErTiOj and TmTiOj are ferromagnetic along with c axis,
antiparallel to the Ti3+ moment. In HoTi03, the Ho^ +
moment has a ferromagnetic component in the be plane
with a smaller antiferromagnetic component along the +a
direction. The Tb^ + moment in TbTiOj has a ferromagnetic component in the ac plane with a smaller antiferromagnetic component along the +b direction. The R'
moments are all close to their free ion values. The
temperature dependence of the magnetization was measured
by neutron diffraction and fit to Brillouin functions
with effective spin 1/2. This behavior is not uncommon
in materials with a large axial distortion in the
crystal field.
12:00
CHI2
The Concept of Spin-torsional Temperature in
SPOT Spectroscopy and the Determination of the Specific
Heat of the Torsional Oscillator CH3 in its Ground
State. I. CAMERON*, P. BURNS and M.M. PINTAR, Dept. of
Physics, University of Waterloo, Waterloo, Ont. N2L 3G1.
The energy ground state of the CH3 torsional oscillator
is degenerate in many solids but it may become
observably split by tunneling if the barrier which
hinders angular displacement is small. It will be shown
that when the above splitting is about equal to the
splitting caused by the Zeeman effect (double resonance)
the spin-torsional temperature concept is applicable.
In general, the torsional and Zeeman reservoirs will
exchange energy to bring themselves to a state of semiequilibrium characterized by a common temperature. A
two dimensional analysis of the proton magnetic
resonance free induction decay in CH3 CD2I after a semiequilibrium has been achieved will be reported for
different values of the Zeeman splitting. From this
experiment the tunneling specific heat will be derived
and compared to results from SPOT spectroscopy.
11:45
CH11 Evidence for a Temperature Dependent Conformational
" Interconversion
"
in K^HfF7. I.A. CUNNINGHAM, W.V.
PRESTWICH, McMaster University - A temperature dependence of the quadrupole interaction between l^lTa nuclei
and the electric field gradient at the hafnium site in
K3HfFy has been observed. Results from measurements
using the method of perturbed angular correlations
indicates that the hafnium atom can occupy one of two
possible sites at liquid nitrogen temperatures and only
one at room temperature. A conformational change is
believed to occurr at approximately 200 K.
TUESDAY, JUNE 17, 1980
HEALTH SCIENCE CENTRE, ROOM 1K8
12:15
Luncheon Meeting ("No Host") to discuss the proposed formation of a
joint Division of CAP & CIC in the general area of Surface, Thin Film
and Vacuum Phenomena.
30
TUESDAY, JUNE 17, 1980
ROOM SS 102
Chairman:
M.F.
Collins
13:30
DAI
14:15
DA2
Phenomenology of Dynamic Effects on the Magnetic Response near T c .
A. Arrott, Simon FAtueA UnlveAilty
In studies of the magnetic properties of iron whiskers Dr. Bretislav Heinrich measures the
dependence of the ac susceptibility on frequency, amplitude, dc bias field, temperature and
sample characteristics such as size, shape, crystal orientation, crystal perfection and impurity
content. In the limit of low frequencies the inphase response is dominated by magnetostatics
and the outphase signal is dependent on eddy currents which are sensitive to the details of the
magnetization processes. These things are reasonably well sorted out above and below the Curie
Temperature, T . But within 100 mdeg K of T (1040 deg K) there are very sharp increases in losses
accompanied by°marked frequency dependence of the otherwise frequency independent intrinsic
magnetic viscosity. By introducing a memory function to describe the viscosity we obtain a
holistic phenomenological description of the whisker response in which critical slowing down
appears as an increase in the time scale of the memory function. Comparision with insulators
indicates that eddy currents, on a microscopic scale, are moving the characteristic frequencies
of critical fluctuations down by four or more orders of magnitude into the range of 1 kH::. The
phenomenology predicts an increase with frequency of the magnetic stiffness also and this is
observed. A discrepancy is noted between the temperature of the peak in slowing down tine and
the T found by extrapolation of the spontaneous magnetization from below and the susceptibility
from above T^. This difference of 10 mdeg K may indicate a crossover into another realm of
critical behavior very close to T .
Critical Behaviour of Magnetic Materials from Electronic Transport Properties
D.J.W. Geldart, VaZhouile UnlveAilty
Recent developments i n t h e t h e o r y o f e l e c t r o n i c t r a n s p o r t p r o p e r t i e s i n t h e v i c i n i t y o f c r i t i c a l
p o i n t s a t second o r d e r phase t r a n s i t i o n s o f ferromagnets and a n t i f e r r o m a g n e t s ( a l s o b i n a r y a l l o y s )
are reviewed.
Some d e t a i l s o f t h e s i m p l e s t r e l e v a n t Boltzmann e q u a t i o n d e s c r i b i n g t h e s c a t t e r i n g
o f e l e c t r o n s f r o m s p i n f l u c t u a t i o n s a r e g i v e n and v a r i o u s c o r r e c t i o n s a r e d i s c u s s e d .
Particular
a t t e n t i o n i s g i v e n t o t h e d e t e r m i n a t i o n o f c r i t i c a l exponent and a m p l i t u d e r a t i o s from a v a i l a b l e
e x p e r i m e n t a l data f o r e l e c t r i c a l r e s i s t i v i t y and t h e i r comparison w i t h t h e o r e t i c a l p r e d i c t i o n s based
p r i m a r i l y on r e n o r m a l i z a t i o n group methods.
15:00
15:15
DA3
Break
Excitations of Small Isolated Clusters of Magnetic Ions
E.C. Svensson, Atomic. EneAgy of Canada Limited
By means of neutron inelastic scattering we have studied^ the magnetic excitations in a single
crystal of KMng,i8 Zn 0.82^3
several wave-vector transfers Q and for several temperatures in the
range 1.4 £ T £ 300 K. In this specimen the magnetic M n 2 + ions and non-magnetic Zn 2 + ions are
randomly distributed over the sites of a simple-cubic lattice giving rise to Isolated clusters of
M n 2 + ions. The ions within these clusters interact essentially via nearest-neighbor antiferroFor this
magnetic exchange (Hamiltonian5^x2 "
simple interaction, one can calculate
exactly the energy levels for the different clusters as well as the neutron scattering for all $
and T, and, using Racah-algebra techniques, we have carried out such calculations for clusters of
2, 3 and 4 ions. At very low temperatures, the principal features in the observed spectra are
peaks at frequencies v - 0 . 9 5 J (from quartets), V - 2J (from pairs with a small contribution from
quartets) and V - 7J (from triplets). At slightly higher temperatures we also observe peaks corresponding to excited-state pair transitions at V - 4J and V « 6 J . The observed frequencies of these
peaks directly give accurate values for J; e.g., 0.100 + 0.004 THz and 0.098 10.002 THz from the 2J
and 7J peaks respectively. In contrast, the technique of electron paramagnetic resonance usually
employed for such studies rarely gives an accuracy better than 10%. In contrast to optical or
magnetic-resonance techniques, neutron scattering can also give information about the wave functions of the states from the variations with <$ of the intensities of the peaks. We have studied
I(Q) in detail for the 2J peak and find excellent agreement between calculation and experiment.
The calculations also give a rather good description of the principal features of all the spectra.
Most of the residual discrepancies can probably be attributed to the scattering by ions in clusters
larger than 4 (36% of the Mn2 + ions in our specimen). In measurements at very high resolution we
have, however, observed that the 0.95 J and 2J peaks have finite intrinsic widths rather than the
6-function lineshapes predicted by the theory. The origin of these excess widths is not understood.
IE.C. Svensson, M. Harvey, W.J.L. Buyers and T.M. Holden, J. Appl. Phys. 49, 2150 (1978) and
to be published.
31
TUESDAY, JUNE 17, 1980
ROOM SS 163
Chairman: J,D. Poll
13:30
DB1
ATOMIC & MOLECULAR PHYSICS SYMPOSIUM
Recent Progress in Lamb Shift Measurements - Theory and Experiment
G.W.F. Drake, UyiLveA&<cty OfS WàjicUoK
The precise measurement of Lamb shifts in hydrogen and hydrogenic ions remains a significant
challenge in experimental physics.
The results provide an important test of quantum electrodynamic computational methods in the presence of strong Coulomb fields.
Methods of measuring
the Lamb shift will be reviewed, and the theoretical significance of the measurements discussed.
The anisotropy method developed at the University of Windsor derives the Lamb shift from
measured rotational asymmetries in the Ly-a quenching radiation from the 2 s w 2 state.
The
method and high precision results for D and He + will be described.
The limitations on theaccuracy and the outlook for further improvements will be discussed.
14:15
DB2
Experiments on Time Reversal Symmetry and Parity
N.F. Ramsey, HaJivtVid UnLv&UxCty
Symmetry under time reversal transformations can be tested by searching for an electric dipole moment
of a nucléon or a nucleus. The neutron is a particularly suitable nucléon since its lack of an electric charge permits it to be subjected to an intense electric field. Recent experiments at the Institut Laue-Langevin^ and at the Leningrad Nuclear Physics Institute 2 will be described. These experiments set a limit of pg/e < 1.6 X 10""^ cm. New experiments now in progress to lower this limit will
be described. These experiments involve the use of ultra-cold neutrons at velocities below 6 m/s.
Such neutrons can be stored in a neutron bottle for more than 20 s. The magnetic resonances with such
stored neutrons are very narrow and are essentially unaffected by the effect of t x v/c, since the
average value of v is almost zero for bottled neutrons. It is expected that the principal uncertainty
in the new experiments will be caused by the magnetic fields from leakage currents associated with the
applied electric field. A means for monitoring these magnetic fields with optically pumped He^ in the
same volume will be described. Experiments at Oxford^ on TIF setting a limit on the proton electric
dipole moment will be described as well as a new experiment at Harvard which should provide an even
lower limit. A summary will also be given of recent experiments on parity violating rotations of the
spin of a neutron passing through various materials, such as tin.
!w. B. Dress, et al., Phys. Rev. D15, 9 (1977).
2
I. S. Altarev, et al., Leningrad Nuclear Physics Institute Preprint 430, 1 (1978).
3 p . G. H. Sandars, et al., Private communication (1979).
15:00
15:15
DB3
Break
Parity Violation in Atoms and Molecules
G. Karl, UrUveMity
otf GueZpk
This is an introductory talk reviewing neutral currents in gauge theories as
well as their application to atoms and molecules. The talk is not directed
primarily to experts in the field.
16:00
DB4
A Laser Test of Parity Violation in Atoms
A.D. May, UnlveAAiXy ofi Toronto
The properties of several novel laser cavity designs are described. It is shown how the beat
frequency between orthogonally polarized modes can be used to measure differential optical effects.
Although such double polarization lasers have a number of applications in both pure and applied
research the main emphasis of the talk will be on the design of a laser cavity for detecting
parity violation in atoms. Simple calculations indicate an ultimate sensitivity of 1 part in
1 0 2 0 , some 6 to 8 orders of magnitude better than current "rotation of the plane of polarization"
measurements. Some preliminary tests of a prototype cavity will be presented.
32
TUESDAY, JUNE 17, 1980
ROOM SS 164
Chairman: Akira Hi rose
WAVES AND INSTABILITIES IN PLASMAS
13:30
DC1
Classical Electron Motion in a Wave of Slowly Varying Amplitude and Damping of a Plasma Wave
with Detrapping of the Electrons
G. Pocobelli, UniveAiHy of ScukcUchewan
Electron motion in a sinusoidal potential wave is similar to that of a mechanical pendulum.
The motion of electrons trapped in the wave corresponds to oscillations and that of electrons
untrapped to rotations of the pendulum. In plasma physics, one generally deals with waves of
variable amplitude. This involves electron transitions from trapped to untrapped conditions,
or vice versa. Approximate, analytical, adiabatic solutions for electron motion in a wave of
slowly varying amplitude were obtained relatively recently by a number of researchers. Unfortunately, as the electron nears the point of transition between trapped and untrapped motion,
the solutions fail, in several respects. I present here a modified (continuity of phase
across the separatrix) and generalized set of such solutions. The set can describe, for the
first time, electron transitions from trapped to untrapped conditions, or vice versa, in a
wave of slowly varying amplitude. Furthermore, the set is formally symmetric with respect to
both kinds of motion, thus providing a single, unified description of oscillatory and translatory motion. An application of the set to the integration of the equations of Vlasov and
Poisson for an electron plasma wave has yielded a self-consistent expression for the damping
rate of the wave, including a contribution from the electrons detrapped from the wave. The
physical consequences of electron transitions on the damping of the wave are discussed. The
talk includes a brief historical and mathematical review of the problem of the motion.
14:15
DC2
Low Frequency Ion Waves Propagating along a
Warm Plasma Slab. NGUYEN T. HUNG, Collège militaire
royal de St-Jean, St-Jean, Quebec - Low frequency ion
waves propagating along the boundary of a plasma slab
are investigated. The basic set of fluid equations for
a collisionless plasma of cold ions and warm electrons,
together with Maxwell's equations, are used to study
the linear and the nonlinear evolution of the low
frequency ion waves. In the linear regime, the
dispersion characteristics of the volume and the
surface waves are studied in term of the wavelength and
the plasma width. In the nonlinear regime, the
equations governing the evolution of the wave
amplitude, as well as their solitary wave solutions,
are shown to depend critically on the relative
thickness of the plasma compared to the wavelength.
14:30
DC3
Stochastic Cascades in Parametric Plasma Wave
Scattering? G. PICARD, T.W. JOHNSTON, INRS-Energie,
Université du Québec, C.P. 1020, Varennes, Québec,
JOL 2P0 - We have explored the time behaviour of a uniform system with parametric plasma wave cascading, with
the non-cascading waves heavily damped. (This system
is relevant to stimulated Brillouin backscatter.) When
fewer than three wave interactions are involved cyclic
behaviour is exhibited, but for more interactions the
results depend on the cascade wave damping. Cyclic or
much more complicated behaviour can be obtained: whether due only to bifurcation or to a strange attractor
is to be determined. Unlike recent work by Wersinger
et al 1 detuning and mismatch play no role in this
phenomenon.
J
J.M. Wersinger, J.M. Finn, E. Ott Phys. Rev. Lett. 44^
(7) 453 (1980).
14:45
DC1
Cascades in Brillouin Scattering? G. PICARD,
T.W. JOHNSTON, INRS-Energie. Université du Québec,
C.P. 1020, Varennes, Ouébec, JOL 2P0 - In stimulated
backscatter, the backscattered wave (if strong, enough)
can rescatter, this new wave can rescatter etc., beginning a cascade which could explain some observed spectra 1 . Prevous (Langmuir) wave cascade analysis considered a spatially uniform system. Computer calculations
with plane boundaries and spatial depletion indicate
that Brillouin cascading is unimportant for heavily
damped phonons, unless there is substantial damping anisotropy and reflection or reflection and very large
light noise source. Sideband-like spectra1 are therefore likely to be due to a more direct nonlinearity
than cascading.
1
R.E. Turner, L.M. Goldman (private communication)
see also their Fig. 3a in Phys. Rev. Lett. 44^ (6)
400 (1930).
15:00
D e t e r m i n i s t i c and S t o c h a s t i c L i a p u n o v
DC 5
Stab i lity of D i s s i p a t i v e MHD E q u i l i b r la • J.
T E I C H M A N N , Un i ve rsit y of M o n t r e a l - T he g l o b a l
stab i lity o f sta t ion ary e q u i l i b r i a of dis s 1 pative M H D is stud led us in g the d i r e c t Liap unov
me tho d.
Su f f leien t and n e c e s s a r y con d i t i on s
for s t a b 1 1 1 ty of the lin e a r l z e d E u l e r - L a g r a n gian s y s t e m w i t h the fui 1 d i s s i p a t i v e ope raS toch a s t i c
tors are gi ven f or t he f irst t i m e .
s t ab 1lity o f the e e q u i l i b r i a is disc u s s ed
Th e
u s i n g the I tô an d th e Mc S h a n e m o d e l s .
ef feet of r a n d o m f l u c t u atio ns is
de s t ab i 1 i z ng
i
d e m o n strate d.
15:15
DC6
Recurrence of Diverging Cylindrical Ion Acoustic
Waves• E. 0KUTSU and L. SCHOTT, Dept. of Physics, U.
of Saskatchewan - Experimental and theoretical investigations are made of nonlinear diverging cylindrical
ion acoustic waves. The experiment is carried out in
an argon plasma with the dimension of approximately 60
cm diameter and 75 cm length. The electron temperature
and the plasma density are 1.5 eV and 1.3 x 10' c m - 3 ,
respectively. Continuously excited sinusoidal waves
are periodically deformed as they travel away from the
exciter and show recurrence of the initial waveform
similar to nonlinear plane waves. In contrast to the
plane case, however, the recurrence is not complete.
This incompleteness is enhanced at large distances from
the exciter where the waves become almost plane waves.
The phenomenon depends strongly on frequency and position of excitation. The experimental results are well
explained by analytic and numerical solutions of the
Korteweg de Vries equation.
*
Research sponsored by the Natural Sciences and Eng.
Research Council of Canada.
33
15:30
DC7
Nonlinear Development of the Buneman Instability.* 0. ISHIHARA, A. HIROSE, Univ. of Sask., and A.B.
LANGDON, Univ. of Calif., LLL - The nonlinear evolution
of the Buneman instability has been studied both analytically and numerically (computer simulation). The analytical model is based on a nonlinear dispersion relation which is derived by taking into account (a) the
frequency and growth rate modulation, (b) the perturbed
electric field up to e £ and (c) the renormalized electron distribution functions. The model can successfully
explain the results of a one-dimensional computer simulation, namely the presence of an algebraic growth stage
following the breakdown of the exponential linear growth
(the field energy at the breakdown is the order of
(m/M) 1/3 W n M/m = ion/electron mass ratio, W D = initial
electron drift energy), the appearance of harmonics, and
the final saturation level (the field energy at saturation is of the order of 0.1 W Q ). The computer simulation reveals that the final saturation is caused by
electron trapping in deformed non-sinusoidal potential
wells and the electrons are completely thermalized.
*
15:45
DC8
Field-Free Plasma for Studying Buneman Instability. * J.D. PAULSON and A. HIROSE, Univ. of Sask. The Plasma Betatron was modified to provide short duration, high electric field pulses (~100 nsec, 52 kV/m).
The principal aim is to create electric field free
plasma conditions suitable for studying the Buneman
instability, which requires that the electron drift
velocity be much higher than the thermal velocity.
Free acceleration of the electrons has been observed to
last for about 70 nsec by which the electron drift velocity has exceeded the initial thermal velocity
(Te = 10 eV) by a factor of more than 50. Immediately
following the free acceleration the plasma temperature
begins to rise reaching a maximum about 150 nsec after
the start of the pulse. The final electron temperature
(350 eV) accounts for all of the energy input into the
plasma indicating complete thermalization of the drift
energy. The observed plasma current is characterized
by almost complete destruction caused by anomalous
resistivity, and consistent with the recent theoretical predictions.
Research sponsored by the Natural Sciences and Eng.
Research Council of Canada.
16:00
*Research sponsored by the Natural Sciences and Eng.
Council Canada.
THE ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS WILL TAKE PLACE IN ROOM SS 164
Discussion of "Study of Future Research Opportunities in Physics"
TUESDAY, JUNE 17, 1980
ROOM SS 165
Chairman:
R.J. Slobodrian
13:30
DDI
NUCLEAR PHYSICS B
Nucleon-Nucleon Elastic Scattering from 200 to 500 MeV.
D. Axen, TRIUMF
A series of measurements of spin correlation parameters in proton-proton and neutron-proton elastic
scattering between 200 and 500 MeV are described. For pp elastic scattering the parameters
D, R, R' and P have been measured in the centre of mass angular range 13 to 58° with an accuracy
of approximately ± 0.02 at 209, 324, 379 and 515 MeV using the TRIUMF polarised proton beam.
Absolute normalization of the beam polarisation was determined by a double scattering experiment.
For np elastic scattering the parameters D t , R^, A t and P have been measured at 220, 325, 425
and 495 MeV at 10° intervals in the center of mass range 60 to 160° with an accuracy of approximately ± .05 using a polarised neutron beam produced by charge exchange in deuterium. Recently
measurements of the np differential cross-section in the angular range
15 to 180° center of mass
and the total cross-section to an accuracy of 1 - 3% have been completed. Analysis of all the
data combined with results from other laboratories has led to a unique and accurate set of 1=0
and 1=1 phase shift solutions.
14:15
DD2
Intermediate-Energy Electron and Proton Scattering
from s-d shell Nuclei* S. YEN, R. S0BIE, T.E. DRAKE,
U. of Toronto; A.D. BACHER et al., Indiana U.;
C.F. WILLIAMSON et al., MIT; W.G. LOVE, U. of Georgia;
F.L. PETR0VICH, Florida State U.
The (e,e') form factors and (p,pO cross-sections and
analyzing powers for collective and particle-hole states
in
Mg and 2 8 Si^, have been measured with the highresolution facilities at MIT and Indiana, respectively.
The quenching of M6 strength in these nuclei may be due
to meson exchange currents as well as to configuration
mixing. Analyzing powers calculated with the Love
t-matrix NN interaction2 show good qualitative agreement with the data, and these prove to be a sensitive
test of both nuclear structure and the proton-nucleus
interaction.
1.
2.
A.D. Bacher, ..., S. Yen et al., in proceedings of
Int. Conf. on High Energy Physics and Nucl.
Structure, Vancouver, August 1979.
W.G. Love et al., Phys. Lett. T3B, 277.
* Supported in part by NSERC, Canada, and in part by
U.S. ERDA and N.S.F.
14:30
DD3
V a r i a t i o n des déphasages de l a d i f f u s i o n p - d
près du s e u i l d ' é c l a t e m e n t du deuton.
F. LAHL0U, R.J.
SLOBODRIAN, P. BRICAULT, S.S. DASRIIPTA, R. ROY e t C.
RIOUX. Univ. L a v a l , L a b o r a t o i r e de Physique N u c l é a i r e .
Nous avons mesuré l a s e c t i o n e f f i c a c e d i f f é r e n t i e l l e de
l a d i f f u s i o n é l a s t i q u e p-d de 3.14 à 3.74 MeV dans l a
r é g i o n du s e u i l d ' é c l a t e m e n t du d e u t o n , à l ' a i d e du Van
de G r a a f f de 7.5 MV. Les mesures plus anciennes é t a i e n t
f a i t e s à des pas de 1 MeV dans l e l a b o r a t o i r e e t les
s e c t i o n s e f f i c a c e s s e m b l a i e n t a v o i r une v a r i a t i o n monotone.
Par c o n t r e , des mesures récentes de r a d i a t i o n
de f r e i n a g e p - d ont montré une anomalie i n t é r e s s a n t e
a u t o u r du s e u i l S des pas de 30 à 50 k e V 1 ) .
line a n a l y se de déphasages de nos données montre une v a r i a t i o n
2
i n t é r e s s a n t e du déphasage S ] / 2 e t l e déphasage u P i / 2
v a r i e de façon assez abrupte en t r a v e r s a n t l e s e u i l .
I l semble y a v o i r p o u r t a n t une c o r r é l a t i o n e n t r e l ' a n o m a l i e de l a r a d i a t i o n de f r e i n a g e e t l e comportement de
la voie é l a s t i q u e .
R.J. S l o b o d r i a n , R. Roy, C. R i o u x , i .
L e t t . 78B (1978) 55.
Frois,
Phys.
34
14:45
Svstematlcs of Neutron-Proton Radius Difference
in NucleiT. D.W.L. SPRUNG, F. MOLZAHN and M. KOHNO, Mc~
Master University—Using the density dependent effective interaction G-0^-, which gives a fair account of
nuclear bulk properties such as binding energy and
charge radii, the neutron proton radius difference A =
r n -r p has been studied for all even nuclei in the s-d
shell and for selected nuclei beyond this region. The
principal systematic effects noted are (i) for N=Z
nuclei, A is negative and can be understood from a
simple model of Varma and Zamick 2 , (ii) for fixed Z, A
grows with N but the slope 3A/3A decreases like A~l.
Calculated A will be compared also with experimental
values.
Work supported by Natural Sciences and Engineering
Research Council
lx. Campi and D.W.L. Sprung, Nucl. Phys. A194 (1972)
401-442
3 C . K. Varma and L. Zamick, Nucl. Phys. A306 (1978)
343-359.
15:00
Break
15:15
DD5
Binding Energies of E Hypernuclei.* J. A.
JOHNSTON, Trlumf, U.B.C. and J. LAW, Univ. of Guelph Using our fitted E-nucléon potentials from an analysis
of the E-nucleon scattering data together with the
E-atomic level shifts and widths data 1 , we have
calculated the binding energies of typical E hypernuclei. Our results indicate that the widths are
rather narrow compared to other predictions2, and are
consistent with recent observation of E hypernuclei.3
'Johnstone,J.
and Law, J., Can. J. Phys. 58, 294
(1980).
C. Batty et al. Phys. Lett. 87B, 324 (1979).
3
W. Bruckner et al. Proc. of the Kaon Factory
Workshop. Aug. 13-14, 1979, 136, (Triumf report 79-1).
In the present study potential inversion techniques
have been employed using a modified scattering function
to fit elastic scattering data and to deduce optical
model potentials. These results will be compared with
those obtained using "unconstrained" models.
Kobos, A.M. and MacKintosh, R.S.
123, 296 (1979)
Ann. of Phys. (N.Y.),
* Supported in part by N.S.E.R.C.
15:45
DD7
Microscopic Calculation of the Potential Energy
Surface of Some Actinide Nuclei with the Modified
Skyrme Interaction?• A.K. Dutta and M.Kohno, McMaster
University—We have calculated the potential energy surfaces of some actinide nuclei, 232Th, 240pu 252pm and
25®Fm, using the two-step iterative method^ for estimating the constrained Hartree-Fock energies with the
modified Skyrme interaction2 . So far, a systematic
calculation of the potential energy surface of a fissioning nucleus has been done only by the Strutinsky shell
correction method. Hence it is desirable to calculate
the energy surface microscopically starting from a twobody effective interaction. Comparison of results of
different interactions gives some insight into the properties of the fission barrier. The modified Skyrme interaction, which gives a better description of the
ground state properties and isoscalar giant monopole and
quadrupole excitations of closed nuclei, was found to
give a very reasonable description of the fission barrier for all nuclei calculated.
^Work supported by Natural Sciences and Engineering Research Council
1 A.K. Dutta, M. Vallieres.R.K. Bhaduri and I.Easson,
to be published in Nucl. Phys. A.
2 S. Nishizaki, K. Ando and M. Kohno, to be published.
2
•Supported by the Natural Science and Engineering
Research Council.
15:30
DD6
Optical Model Potentials Derived by Potential
Inversion Techniques.* R.J.W. HODGSON, Univ. of
Ottawa - Recently it has been demonstrated that very
good fits to elastic scattering data can be obtained
by employing "unconstrained" optical potentials.! The
introduction of ^-dependent potentials to explain a
variety of elastic scattering data also demonstrates
the limitation of standard optical model potentials.
16:15
THE ANNUAL MEETING OF THE DIVISION OF NUCLEAR PHYSICS WILL TAKE PLACE IN ROOM SS 165
TUESDAY, JUNE 17, 1980
ROOM SS 271
Chairman: W. V. Prestwich
13:30
DEI
16:00
DD8
Non-Linear Collective States in Nuclear Matter.
I. EASSON, McMaster U. - Large amplitude longitudinal
collective modes for spin and isospin saturated nuclear
matter are found, using semiclassical techniques (kinetic theory and hydrodynamics) combined with a selfconsistent density-dependent interaction of the Skyrme
type. The essential ingredient which permits the existence of these states is a balance between non-linear
profile steepening and the dispersive effects of surface energy. The modes found are non-linear zero sound
waves and zero-sound solitons ("zerons"). The theory of
slowly modulated wavetrains of non-linear zero sound
is also developed. These excitations may be important
in neutron star interiors and in heavy ion collisions.
APPLIED NUCLEAR SCIENCE
Progress in Accelerator-based Radioisotope Dating*
H.R. Andrews, CkaZk ZiveA NucZe/Vi La.bo'uUo'Uci
14
With the direct detection of
C at natural concentrations by workers at the Lawrence Berkeley
Laboratory, the Toronto-Rochester-General Ionex collaboration and the McMaster-Simon Fraser
group in 1977, a way was opened for exciting new developments in such varied fields as archaeology,
geophysics and climatology. At present a score of laboratories are active in the field and
several dedicated facilities are under construction. The advantages of and principles underlying
the direct counting method will be presented and the present status of work at Chalk River and
elsewhere will be reviewed.
* Work at Chalk River done in collaboration with G.C. Ball, R.M. Brown, W.G. Davies, Y. Imahori
and J.C.D. Milton.
35
14:15
DE2 I>etermination of Sulphur Content of a Lunar
Sample by Neutron Capture Gamma-ray Spectrometry. M.A.
ISLAM, W.V. PRESTWICH, T.J. KENNETT, C.E. REES, McMaster
University - The technique of prompt neutron capture
gamma-ray spectroscopy has been used to determine sulphur
concentrations in extraterrestrial materials. In
particular an effort was made to resolve reported discrepancies in the sulphur assays for the lunar rock
sample 70215. While the validity of chemical analysis
techniques are often influenced by the chemical form of
the sulphur, particularly when in low concentration, the
method used here is independent of such effects. The
lunar and bulk Allende meteorite sample were analyzed
for sulphur^iron and silicon. The latter material,
being well documented, was analyzed in order to verify
the techniques of measurement and the subsequent methods
of data reduction. Based upon our measurements and the
acceptance of the silicon and iron content of the lunar
sample the sulphur content was found to be 1T^1±112 ppm
by weight.
14:30
DE3
Trace Element Scanning of Human Hair by PIXE
and RBS.
S. B. RUSSELL, R. S. GIBSON, S. FAIQ and J.
L. CAMPBELL, Dept. of Physics, U. of Guelph - The trace
element profile along a human hair, which is indicative
of prior nutritional status, can be determined by PIXE
analysis. We investigate the use of RBS as a means of
measuring the mass of the segment under analysis
(< 1 mm) simultaneously with the X-ray measurement.
The RBS reveals specimen damage at current densities
> 4 nA/mm , which are too low to provide acceptable
X-ray statistics. The PIXE analysis is therefore
performed in a helium or air atmosphere at much higher
current densities. Some general aspects of the PIXE/RBS
analysis system recently installed on the Guelph 3 MV
Van de Graaff accelerator will be mentioned.
15:15
15:30
DE6
Automatic Image Processing System for Nuclear
Film Detectors. C.E. Zarate and T.J. Kennett Physics
Dept., McMaster University - We report the development
of a system to process automatically nuclear film
detectors by interfacing a commercial television camera
to a computer and analysing the two level image of
white objects on a dark background. Two analysis
methods were used; it is concluded that they have different ranges of application. For intermediate to high
fluencies (>100 impacts/mm 2 ) the antitransformation of
the white line length distribution function obtained
throughout a raster scan provides results with
uncertainties smaller than the statistical fluctuations
of the hole density in the film. For fluencies down to
20 impacts/mm2, a direct image analysis gives more
accurate results in reasonably short times. The limiting factor for very low fluencies is the resolution of
the television camera.
15:45
DE7
Ground Support Equipment for the NASA Halogen
Occultation Experiment (HALOE). R. DICK and S. M. TILL,
Barringer Research Limited, Rexdale. - A solar
simulator and an optical absorption cell have been
designed and developed to radiometrically test and
calibrate the HALOE instrument 1. The simulator
incorporates a furnace and has a radiance in the 2 to
11 micron range of 0.25 to 0.5 of the solar radiance.
The absorption cell is part of an ultrahigh vacuum
system, and is to contain low concentrations (80 to
2000 ppm)of the gases HC1, HF, NO and CH4, monitored
using a mass spectrometer. The design and response of
the test system will be described.
1
14:45
DE4 The Use of 25 KeV Neutrons for In Vivo Neutron
Activator Analysis of Spinal Calcium. T. COUSINS, T.J.
KENNETT, W.V. PRESTWICH, C.E. WEBBER. McMaster
University - A nearly monochromatic beam of 25 KeV
neutrons has been produced at the McMaster Nuclear
Reactor by transmission of an incident fission neutron
spectrum through a filtering system consisting of iron,
aluminum and sulphur. The beam may be made incident
upon the human body, where, after moderation, spinal
calcium content may be determined via the
n,Y)^9Ca
reaction. Thus a technique for diagnosing various
demineralizing bone diseases is presented. Successful
irradiations have been carried out on spinal phantoms
and excised vertebrae contained in a water bath. The
thermalized neutron distribution in the water
bath was determined and shown to be more strongly
peaked in the region of the spine for the incident
25 KeV beam than for an incident fission spectrum beam.
This, together with the lower dose rate associated with
25 KeV neutrons, gives a technique of greater sensitivity (counts/kg. Ca/Sv.) for measuring calcium
content.
15:00
DE5 A High Energy Photon Absorbed Dose Calorimeter.
L. BUJA-BIJUNAS, D.W.O. ROGERS, C.K. ROSS and G.D.
SMITH, National Research Council, Ottawa - The X-Rays
and Nuclear Radiations Section of NRC is responsible
for
the development
and maintenance of national
standards for the dosimetry of ionizing radiation.
The increasing use, in cancer clinics, of high energy
(5-35 MeV) photon radiation from linacs has required
the development of a method for the measurement of
absorbed
dose
due
to high
energy
photons.
A
calorimetric standard is presently under construction
in which absorbed dose is directly measured
by
monitoring the temperature rise of a small graphite
disk placed inside a large graphite phantom.
The
temperature rise during an irradiation of 100 rad/s
is only 1.4 x 10"^ K/s.
Because of the microscopic
size of the components used and the need to insure
thermal isolation of the absorbing disk, extreme care
is
required
in
the
calorimeter
design
and
construction.
The
accuracy
of
absorbed
dose
measurements using this calorimeter is expected to be
better than 1%.
Break
The HALOE instrument, a variant of the Barringer
infrared gas correlation spectrometer, is being
developed by TRW to measure trace gases in the
atmosphere from Space Shuttle.
16:00
DE8
The Dependence on Energy and Geometry of the
Resolution Function ot Symmetric and Asymmetric Timing
Spectrometers used in Positron Annihilation. P.J.
SCHULTZ, J. ILOWSKI and I. K. MacKENZIE, Univ. of Guelph
- The resolution function of a fast coincidence system
is described by the convolution of a Gaussian function
with back-to-back exponentials. The centroid of this
distribution is shown to vary by as much as 30 psec
depending on the relative orientation of the photomultipliers, the radial and azimuthal location of the
source and on the energy of the source. Cd-115m is
shown to be very much preferable to the usual C0-60 as
a prompt source for asymmetric systems.
16:15
DE9
Electrostatic Modelling of a Multiwire Proportional Chamber.* L.R. LUFTON, Queen's University Formulae have been developed to permit the calculation
of electrostatic potentials within a Multiwire Proportional Chamber, which includes a central anode plane,
two planes of cathode wires, and two planes behind the
cathodes at some arbitrary negative potential. The
expressions have been used to predict the induced
charge distribution on the anode, cathode and backplanes as a function of time. Our particular application for this geometry is a chamber which includes two
lead converter plates behind the cathodes to yield
good efficiency for gamma-ray detection in a medical
imaging system. The computer codes allow one to determine an optimum chamber geometry and to predict the
pulse response. Results of the calculations will be
presented using the high resolution detectors being
developed at Queen's as an example.
* Supported by N.S.E.R.C. and the Ontario Heart
Foundation.
36
FILMS AND INTERCALATION
TUESDAY, JUNE 17, 1980
ROOM SS 270
Chairman: D.E. B r o d i e
13:30
DF1 The Problem of Comparing Pure Vacuum Deposited
Films.* C.J. MOORE and D.E. BRODIE, Department of
Physics, University of Waterloo - The reproducibility
of amorphous thin films has been the major problem
encountered in electrical characterization studies.
The key to reproducibility is the ability to prepare
samples by: (1) duplicating fabrication conditions to
a high degree. (2) controlling the stoichiometry and
Impurity content of the films. This paper reports on
the reproducibility, the conductivity and the
crystallization temperature of films of a-ZnTe and
a-ZnSe. In particular, the residual gas content
changes the magnitude of the conductivity and its
functional dependence on temperature as well as the
temperature at which rapid crystallization occurs.
All measurements were made in situ using planar or
sandwich sample configurations in a very high vacuum
system in which the residual gas content could be
controlled. When preparing and studying pure films
in different laboratories or systems, agreement can only
be obtained, if the films are fabricated in a good
vacuum (£ 10"^ torr) under conditions which ensure the
appropriate stoichiometry and purity,
•supported by NSERC
13:45
DF2
Electronic Surface States Induced by Periodic
Potentials and Image Charges. J.M. BARIBEAU et J.D.
CARETTE, Centre de Recherches sur les Atomes et les Molécules, Université Laval, Québec. Although the energy
band structure in solids is often analysed by the means
of the infinite unidimensional potential, in fact, the
finite dimension of a real solid assign supplementary
boundary conditions. Moreover, if electric charges,
for instance electrons, are present near the surface
they induce in the metallic solid image charges. The
potential of these latter charges will interact with
the periodic potential of the finite lattice. The analysis of the resulting electronic states at the surface shows that discrete states specific to the surface
are then generated. These discrete surface states are
different from those of the bulk; they obey to a Rydberg
like series given by the following law E » l/(n + a) 2 .
This states are compared to available experimental results. Comparison is also made with other types of surface states, Tanri's and Shockley's states.
14:15
DF4
Ionic Feedback in Dynamical Conditions in Semiconducting and Emissive Cylindrical Channels.
C. BOUCHARD and J.D. CARETTE. Centre de Recherches sur
les atomes et les molécules, Université Laval, Québec.
L'étude des canaux multiplicateurs d'électrons en régime de saturation de courant entretenu au moyen du phénomène de retour ionique apporte un éclairage nouveau
sur la question du temps mort dans ce type d'appareil.
A partir des éléments de base et de résultats expérimentaux, les auteurs ont pu mettre au point un modèle
qui rend compte des observations effectuées. Les principales étapes dans la solution du problème considéré
sont:
- la solution en régime continu des équations décrivant
le comportement d'un cylindre semiconducteur et émissif soumis à un courant d'excitation indépendant du
retour ionique
- l'introduction des délais causés par les temps de
transit des particules à l'intérieur du cylindre,
- l'étude de la relaxation introduite par la capacité
du cylindre.
A partir des résultats obtenus il est possible de concilier des points de vue différents.
Recherche supportée par le CRSNG et le MEQ.
14:30
DF5
Electrical Properties of a-Cd^As?.* D.I. ENNS
and D.E. BRODIE, Dept. of Physics, Univ. of Waterloo Amorphous films of Cd3As2 have been fabricated at
residual gas pressures of ^10" 9 Torr. This pressure is
2-3 orders of magnitude lower than that reported by
Zdanowicz and Miotkowska1 and as: a result, their
prescription for producing amorphous films does not
apply. Hall, Seebeck and electrical conductivity
measurements on the a-Cd3AS2 have been made as a
function of temperature. Mobilities in this amorphous
material are about 200 cm2/Vs! The model suggested for
the a-Cd3As2 films studied here is a degenerate semiconductor with Ec-Ef^0.013 eV and a density-of-states
at E c of ^4x10-19 cm" 3 eV - 1 . Clearly the phase
coherence length for the electrons in the extended
states is much longer than in other amorphous semiconductors .
1
L. Zdanowicz and S. Miotkowska, Thin Sol. Films 29,
177 (1975).
* Supported by NSERC.
Work supported by the CRSNG and the MEQ.
14:00
DF3
Amorphous Phthalocyanlne .* M. MINDORFF and
D.E. BRODIE, Department of Physics, University of
Waterloo - a Phthalocyanlne has been prepared by
vacuum depositing sublimed Phthalocyanlne onto quartz
substrates, cooled to liquid nitrogen temperatures.
Differential thermal analysis as well as x-ray
diffraction was used to study the crystallization to
the a-phase which occurs from 325 to 410K, and the
subsequent irreversible phase change from a- to the
B-phase near 470K. Silver, ohmic contacts were used
to study the I-V characteristics of the amorphous
phthalocyanine and the temperature dependence of the
conductivity. Space charge limited currents are
observed in sandwich structures and space charge
limited currents with trapping are observed in planar
structures. Surface states in the planar structures
introduce surface band bending which alters with
occupancy. This makes this structure difficult to use
for the study of bulk electrical properties.
supported by NSERC.
14:45
DF6
Aspects of Anodic GaAs Oxides.* J.D.
CANADAY, and C.W. FISCHER, University of Cuelph Galvanostatic anodization of n-type GaAs in a
methanolic KOH electrolyte has been studied as a
function of current density and electrolyte normality.
This paper reports measurements of oxide formation
efficiency, density, and stoichiometry and will
discuss and compare the methanolic KOH electrolyte
with those based on tartaric acid. The data is
consistent with a Faradic oxidation mechanism and
an anodizing current exponentially related to the
oxide field. Rutherford's back scattering
measurements in a channeling direction are also
used as an independent measurement of the oxide
density and stoichiometry. The back scattering
technique is also used to measure the fraction
of the oxide formed by oxygen ion transport.
*Supported by NSERC.
15:00
Break
37
15:15
DF7
Anomalous D i f f u s i o n of Aq i n NbSe2. J.T.
FOLINSBEE and M.H. JERICHO, Dalhousie U. - An e l e c t r o n
m i c r o p r o b e has been used t o measure t h e d i s t r i b u t i o n
and motion o f s i l v e r i n t e r c a l a t e d e l e c t r o l y t i c a l l y
i n t o t h e l a y e r e d compound NbSe2 from an aqueous AgN03
solution.
As the s i l v e r
e n t e r s t h e c r y s t a l , a sharp
boundary separates the i n t e r c a l a t e d and u n i n t e r calated regions.
The s i l v e r c o n c e n t r a t i o n a t t h i s
boundary r i s e s from 0 t o 5SS b y w e i g h t over a d i s t a n c e
o f - 0 . 1 mm. The boundary advances i n t o the c r y s t a l
d u r i n g i n t e r c a l a t i o n a t speeds o f - 2 0 ym/s, and t h e
s i l v e r can p e n e t r a t e s e v e r a l mm i n t o the sample,
a l t h o u g h o n l y the edge o f the sample i s immersed i n t h e
electrolyte.
When i n t e r c a l a t i o n i s stopped, v e r y
l i t t l e f u r t h e r d i f f u s i o n o f t h e s i l v e r i s seen; t h e
d i f f u s i o n c o n s t a n t o f the boundary i s l e s s than
l û - 1 0 cm2/s.
15:30
DF8
Optical Transmission of Li NbSe,. J.C.H. Chiu and R.R.
Haering, Department of Physics, University of British
Columbia - Thin single crystals of 2H-NbSe2 have been
electrochemically intercalated with lithium to form
Li NbSe (0< x <1). The optical properties of these
materials were investigated by in situ transmission
studies for photon energies in the range 0.5 ev 3.8 ev. The observed absorption consists of a broad
interband peak near 2.68 ev and a characteristic free
carrier absorption edge near 1.5 ev, which shifts to
longer wavelength with increasing Li content.
We have
analyzed the free carrier absorption in terms of the
Drude model and have shown that Li intercalation is
associated with a partial charge transfer of electrons
between the Li band and the host NbSe. d ? band.
2
15:45
DF9
Intercalation Cells using Ag with TaS; and TiS2
Electrodes. G.A. SCHOLZ, J.M. REYES* and R.F. FRINDT,
Simon Fraser University - In both layered compounds
staging is found to occur using X-ray analysis. For the
AgxTaS2 electrodes a stage-II structure (alternate layers occupied) is observed for x ~ 1/3 and a stage-I
structure (all layers occupied) is observed for x ~ 2/3.
For AgxTiS2, stage II is observed for x w 1/5 and
stage-I for x & 2/5. This is correlated in the cell
potential and in the optical properties of transparent,
intercalating crystal electrodes.
*Now at Ontario Research Foundation, Mississauga,
Ontario.
16:00
DF10
Structure Determination of Ll^TlS^ by Neutron
Diffraction. J.R. Dahn, W.R. "McKInnon and R.R.
Haering, Department of Physics, University of British
Columbia and W.J.L. Buyers and B.M. Powell, Atomic
Energy of Canada Limited, Chalk River, Ontario
- The crystal structures of the intercalation
compounds of LixTiS2 are investigated by neutron
diffraction for x = 0.12, 0.33, 0.67 and 1.0. The Li
atoms are shown to preferentially occupy the
octahedral sites in the van der Waals gaps of the
host TiS2 lattice for all values of x and no evidence
for Li ordering is observed.
ANNUAL BUSINESS MEETINGS
TUESDAY, JUNE 17, 1980
CHAIRMAN
TIME
ROOM
16:00
BS 108
Division of Aeronomy & Space Physics
16:15
SS 165
Division of Nuclear Physics
D.M. Sheppard
16:15
SS 270
Division of Physics Education
J.R. Stevens
16:00
SS 164
Division of Plasma Physics
H. Van Andel
16:00
BS B103
Division of Theoretical Physics
B. Bergersen
TUESDAY EVENING
Evening at the Theatre
"A Flea In Her Ear" by Feydeau
Shaw Festival Theatre
Niagara-On-The-Lake
Transportation by bus with supper en route.
Time to see the town. DEPARTURE TIME - 18:00
Bus trip without supper.
DEPARTURE TIME - 18:45
C.D. Anger
38
WEDNESDAY, JUNE 18, 1980
ROOM SS 102
Chairman: A.V. Gold
9:00
EA1
METALS
Optical Properties of Impurities in Semiconductors
R. Barrie, UniveMiXy of S>Utiih Columbia
The usual treatment of the optical properties of Impurities starts by making an adiabatic approximation followed usually by a Condon approximation. An alternative approach will be presented.
In this, neither the adiabatic (in its usual sense) nor Condon approximation is made. A fieldtheoretic Hamiltonian which includes some of the terms linear and quadratic in the phonon variables will be used. The restriction is made that only one electron may be bound to the centre.
Results for absorption, emission and scattering processes, valid for any strength of electronphonon coupling, will be presented. Comparison between this approach and the usual one will be
made. No comparison with experiment will be made.
9:45
EA2
Metallic Glasses: New Playground for the Low Temperature Physicist
R. Harris, McGltt UniveA6iXy
The properties of metallic glasses, particularly at low temperatures, provide a variety of challenges to
both experimental and theoretical physicists. In reviewing the field, special attention will be paid to
those questions which have yet to be answered, and there will be an attempt to illustrate how the study
of metallic glasses relates both to conventional solid state physics and to the understanding of the
glassy state of matter.
10:30
Break
10:45
EA3
Electronic Structure of Dilute Alloys - Evidence from the de Haas-van Alphen Effect
P.T. Coleridge, national KmeaAch Council of Canada
In dilute alloys the small changes of Fermi surface and the damping Induced by impurities can be measured
by the de Haas-van Alphen effect. Some of the special techniques used for these measurements will be
described and some typical results presented. An alloy self-energy, calculated using the muffin-tin
approximation, provides a useful theoretical framework to discuss the results and to relate them to more
concentrated alloys.
11:30
EA4
Charge Density Waves in Potassium
W.R. Datars, McMcuteA UniveAiity
Overhauser has predicted that the ground state of potassium is a charge-density-wave (CDW)
state. However, it has not been observed directly by neutron diffraction and some properties
of potassium can be explained in terms of the normal ground state. Other properties appear
anomalous and suggest the possibility of a CDW state. Such recent results include low and
high-field induced torque and the pressure dependence of the de Haas-van Alphen effec';. The
torque pattern has alarge, four-fold anisotropy in fields below ItT. Above this field, further
increases with magnetic field in sharply-defined magnetic field directions are characteristic
of open orbits which are not predicted by the normal state. The change of the de Haas-van
Alphen frequency with pressure is less than that expected from free-electron scaling and the
Fermi surface anisotropy increases with pressure. These results are discussed in terns of
th3 CDW model of potassium.
39
WEDNESDAY, JUNE 18, 1980
ROOM BS 108
Chairman:
SYMPOSIUM ON THERMONUCLEAR FUSION IN CANADA:
PROGRESS AND PROSPECTS
H.W.H. Van Andel
9:00
EB1
Status and Prospects of the Canadian Fusion Program
T.S. Brown, National Re6eaAch Council of Canada
The National Research Council, as the designated federal lead agency for fusion R/D, has completed
the conceptual planning and has underway detailed preparations for a national program of fusion
R/D. The Advisory Committee on Fusion-Related Research played a key role in the planning of this
program. A fundamental tenet of the program is that international collaboration is a necessity
for Canada, and that, in order to support this, a relatively narrow specialization is required in
each of the three broad areas of fusion R/D (magnetic confinement, inertial confinement and
materials/engineering).
Because fusion test reactors are already under construction elsewhere
for operation in 2 to 3 years; because construction of demonstration power systems is planned
to start in about 15 years; and because it takes about 10 years to establish scientific and technical competence in a sophisticated technology such as fusion; the program will have to build
rapidly in the next few years. Otherwise, it appears increasingly possible that Canada wi11 be
excluded from exploiting fusion technology except on a licensed or branch-plant basis.
Because of
the limited scientific and technical expertise currently available, the program envisages a
significant strengthening of fusion R/D in the universities in order to ensure the availability
of the requisite skilled scientists and engineers.
Details of the rationale, current status and
schedule for development of the program will be described.
9:45
EB2
Magnetic Confinement Research in Canada
B.C. Gregory, ZWRS EneAgie
10:30
10:45
EB3
Break
Inertial Confinement Research in Canada
A.J. Alcock, National RueaAch Council o(, Canada
11:30
EB4
Fusion-related Materials Research in Canada
J.E. Robinson, McMaiteA UniveAiity
40
SYMPOSIUM ON ELECTRON SCATTERING,
DEDICATED TO THE MEMORY OF ERNEST M
WEDNESDAY, JUNE 18, 1980
ROOM SS 163
Chairman: L. Krause
9:00
9:15
EC1
Tribute to Father Clarke by A.D. Weingartshofer, St. Francis Xavier University
Electron Scattering by Highly Polar Systems*
B. Bederson, New Volk
UniveMiMj
The scattering of atoms and simple molecules that possess unusually high electric dipole
polarizabilities (e.g., alkali atoms and dimers, alkali halide molecules and dimers) by slow
electrons presents unique challenges in both theory and experiment. Recent work involving elastic
and inelastic scattering of ground and excited states by such systems will be reviewed. The
special difficulties resulting primarily from the long-range nature of the r"1* potentiel, and the
subsequent demanding requirement of high angular resolution in the forward scattering direction,
will be noted. Effects caused by the usually high anisotropy of highly polarizable systems, and
the problems associated with effecting proper comparison of theory and experiment will also be
discussed.
*Work supported by the United States Department of Energy, Basic Sciences Division.
10:00
EC 2
Optical Polarization and Polarization-Correlation Studies Following Electron Impact Excitation
J.W. McConkey, UniveAiiXy of {Hindi01
A study of the polarization of the radiation emitted from atoms following electron impact excitation
has long been used as a probe of the excitation of the individual magnetic sublevels.
Comparison
between theory and experiment has been quite good, particularly in the threshold region where simplifying angular momentum assumptions can be made.
The present paper discusses how these: studies have
been extended recently into the realm of molecular targets.
Additional information can be gained
about the scattering process or the excited target if the scattered electron and the decay photon
resulting from the excitations are detected in coincidence.
These exciting angular-correlation and
polarization correlation experiments will be discussed and possible future developments highlighted.
10:45
EC 3
Electron Scattering In Intense Laser Fields
A. Weingartshofer, Si. Flancii Xaviel Uni.veA6ity
We have successfully measured in our laboratory the laser-induced absorption and emission of up to
five photons by free electrons 1 ' 2 . These multi-photon experiments are referred to as Free-Free
(F-F) Transitions in Intense Laser Fields and are basically three-beam, electron-atom-photon,
scattering experiments, however, they provide only information on the interaction between the free
electrons and the photons - very important in itself - the target gas is simply a momentum buffer.
In this paper we will describe new developments in F-F transitions but concentrate primarily on
possible experiments that can hopefully give information on the target gas as well, i.e. one
possibility is to measure resonance profiles in 1-photon F-F transitions. We are pursuing such a
program. These experiments are to be conducted at definite scattering angles with a pulsed TEA CO2
laser and with a very efficient and fast electron detection system. These requirements will be
described in the presentation along with some of the topics that are on the agenda of a workshop on
F-F transitions to be held in France, June 2-6, 1980 with the purpose of planning the future
development of this new field in physics.
1
11:30
EC4
Phys. Rev. Lett. 39, 269 (1977).
2
Phys. Rev. A 19, 2371 (1979).
Electron Scattering by Adatoms and Admolecules
J.D. Carette, Univeliité Laval
Atoms and molecules bounded to the surface of solids possess vibrational modes which are completely
different from the vibration modes (phonons) of the substrates. Being linked at the interface solidvacuum, their binding energies are also of different nature of the binding energies existing between
the atoms of the solid particularly for metallic and ionic solids. Electron spectrometry used in
energy loss spectra represents one of the most powerful tool for measurements of the vibrational
quanta of adatoms and admolecules because of the dipolar interaction between incident electrons and
the dipole induced by the atoms and molecules adsorbed on the surface. This experimental method is
sensitive to the component of the induced dipole perpendicular to the surface. Measured vibrational
spectra for adatcns, namely hydrogen and oxygen atoms, and for admolecules, 0,, CO, H^O, D 2 0, NHj,
ND,, CH,0H, C„H.0H and CH,C0CH,, are used to study the mechanism of adsorption of these species on
two types of surface: technological surfaces (stainless steel 304) and perfectly characterized or
ideal surfaces (the face (100) of a tungstene single crystal. Very interesting results may be
obtained about the non-dissociative or dissociative type of adsorption for the molecules and also
about the cooperative and competitive processes of adsorption of two types of molecules or atoms
simultaneously present in the residual gas. This latter aspect is considered particularly for the
cooperative adsorption of H ? 0 and 0 ? on SSE-404, and the former for the competitive adsorption of
two states of adsorbed hydrogen, the a and 6 states, on the face (100) of tungstene.
41
WEDNESDAY, JUNE 18, 1980
ROOM SS 165
Chairman: W. McLatchie
9:00
EDI
Life Below the Coulomb Barrier:
NUCLEAR PHYSICS C
le
F
and
20
Ne
H.-B. Mak, Queen'i UniveMity
Resonance studies and the Doppler shift attenuation method are extremely useful techniques for
investigating the properties of bound and unbound levels in light nuclei. Such measurements can
be carried out with low energy Van de Graaff accelerators which offer high beam intensity as well
as good energy resolution. Recently at Queen's University, a windowless cryopumped gas target
has been used to study the 1~ and 3 levels of the K7I=0 band in 2 0 Ne and the alpha widths of the
Jïï=l+ and 1~ levels at 5.6 MeV in 1 0 F through the (a,y) and (a,a) reactions. With good overall
energy resolution and low gamma ray background, alpha widths as small as 30 eV and gamma widths
as weak as 0.5 meV have been measured with ^10% accuracy. With an 1 8 0 target 1 ) implanted in Ta
and with a T a 2 1 8 0 5 target, the lifetime of the short lived 1.042 MeV level in 1 8 F (t<5 fs) has
been measured using the (p,n) reaction near threshold. The results of these experiments will be
discussed.
')
The targets were supplied by AECL, Chalk River.
9:45
ED2
Hydrogen Burning of 3 K in Explosive Oxygen
Burning.
C.-W. CHENG, S.K. SAHA, J. KEIN0NEN+,
H.-B. MAK and W. McLATCHIE, Queen's Univ. - The
resonance strengths for the ^ y K(p,Y) 4u Ca reaction have
been measured from 0.70 to 2.90 MeV using a Ge(Li)
detector. Stellar reaction rates, N A <ov>, at several
gamma-rays, which span 50 new energy levels extending up
to 2 MeV in the excitation. A sextet of the lowest lying
levels due to coupling of an odd gq/2 proton and an odd
<*5/2 neutron has been identified as: 0.0(7+), 34.40(4+),
35.63((2)+), 36.41(3+), 45.27(5+) and 49.32(6+).
temperatures of astrophysical interest are compared
The effect of the
with theoretical calculations
revised reaction rates on the 3 9 K abundance will be
discussed.
11:00
ED6 The (t,d) Reaction on 121,Te,
Te,
Te and
130
Te Nuclei.
M.A.M. SHAHABUDDIN, J.A. KUEHNER and
À.A. PILT, McMaster University, Hamilton, Ontario—
1 2 » M 2 6 M 2 8 M 3 0 T e ( t i d ) 1 2 5M27M2<>M3 1 T e r e a c t i o n s
The
'Woosley, S.E., Fowler, W.A., Holmes, J.A. and
Zimmerman, B.A., Caltech Preprint, 0AP-422 (1975).
were performed with a 16 MeV triton beam from the
sputter-source and FN Tandem accelerator system of
our laboratory. The reaction products were analyzed
in an Enge split-pole spectrograph and were detected
by a delay-line counter at the focal plane. The overall resolution for the d-spectra was ^ 14 keV (FWHM).
Several new levels were observed in each residual
nucleus. The d-spectra from these Te(t,d) reactions
are not very different from the proton spectra obtained
in (d,p) reactions on same target nuclei. DWBA analysis
of these Te(t,d) reaction data are performed and will be
shown.
^Visiting scientist from Dept. of Physics, Univ. of
Helsinki, Finland.
10:00
ED3
P o l a r i s a t i o n - a s y m é t r i e dans l e t r a n s f e r t à
deux nucléons e t l ' i n v a r i a n c e par r a p p o r t au r e n v e r s e ment du temps, C. RI0UX, R. ROY, R . J . SL0B0DRIAN, U n i v .
L a v a l , H.E. CONZETT, P. von R0SSEN, F. HINTENBERGER,
R.M. LARIMER, U n i v . o f C a l i f o r n i a , B e r k e l e y - La compar a i s o n de l a p o l a r i s a t i o n d ' u n p r o d u i t de r é a c t i o n S
s p i n d i f f é r e n t de zéro avec l ' a s y m é t r i e de l a s e c t i o n
e f f i c a c e pour l a r é a c t i o n i n v e r s e , i n i t i é e avec un
f a i s c e a u p o l a r i s é e s t une v é r i f i c a t i o n p o s s i b l e du p r i n c i p e d ' i n v a r i a n c e par r a p p o r t au renversement du temps.
Nous avons é t u d i é p l u s i e u r s r é a c t i o n s ( 3 H e , p ) avec dét e c t i o n de l a p o l a r i s a t i o n au l a b o r a t o i r e du Van de
G r a a f f 3 l ' a i d e de l ' i n s t a l l a t i o n de p o l a r i m é t r i e 1 ) e t
l e s a s y m é t r i e s des s e c t i o n s e f f i c a c e s ( p , 3 H e ) des r é a c t i o n s i n v e r s e s â l ' a i d e du f a i s c e a u p o l a r i s é de haute
i n t e n s i t é au c y c l o t r o n de 88" au Lawrence B e r k e l e y
L a b o r a t o r y de 1 ' U n i v e r s i t y o f C a l i f o r n i a .
R.J. S l o b o d r i a n , M. I r s h a d , R. L a b r i e , C. R i o u x , R.
Roy e t R. Pigeon, N u c l . I n s t r . and M e t h . , 159 (1979)
413.
10:30
ED4 Mixed-j Neutron Pickup to 5l*Mn.
J.A. CAMERON,
E. HABIB, A.A. PILT, V. JANZEN and R. SCgUBANK, McMaster
55
University, Hamilton—The reaction Mn (d, t) " M n has
been studied with 17 MeV polarized deuterons. Two
groups of states are strongly excited: lp-3h states are
characterized by pick-up with j n = 1/2, 3/2, 5/2 and
2p-4h states with j n = 7/2 transfer. Measured spectroscopic factors for these transitions will be compared
with shell model calculations.
10:45
ED5 Low spin states of 9 6 Tc
H.A. MACH and M.W. JOHNS,
McMaster University, Hamilton.—Low spin states of 9 s Tc
were investigated via the (a,n) reaction at 14 MeV for
the a beam. Gamma-ray energies, intensities, gammagamma coincidence probabilities, gamma-ray angular distributions, electron conversion coefficients and polarization coefficients were determined for more than 150
11:15
ED7 The Low-Lying Energy Levels of '31*Cs.
A.G. LEE
and R.G. SUMMERS-GILL, McMaster University, Hamilton—
The 1 33 Cs(d,p)13,,Cs reaction has been studied with 12
MeV deuterons from the McMaster tandem accelerator. The
protons were analyzed in an Enge split-pole magnetic
spectrograph. Angular distributions were measured from
7.5° to 75°. States at 0, 11, 60, 138, 174, 191, 207,
234, 263, 344, 377, 434, 451, 580 and 623 keV have been
found. By fitting the angular distributions to DWBA
calculations the ^-transfers and spectroscopic factors
can be determined. A detailed comparison with the
(n.Y) data of Alexeev et al1 is made.
1
Alexeev et al, Nucl. Phys. A248, 249 (1975).
11:30
ED8 Single-proton states of I 5 9 Ho.
E. HAMMAREN and
D.G. BURKE, McMaster University, Hamilton, Ontario—The
159
proton-hole character of states in
Ho has been
studied using the 1 6 2 ' 1 6 l Er(p,a) 1 5 9 ' 1 6 'Ho reactions
with 17 MeV protons. The 16 Er target nucleus needed
to study
Ho with a single proton pickup reaction is
unstable, but (p,a) and (t,a) cross sections are known
to be well correlated for strongly populated states in
this mass region. Angular distributions from tritoncluster-transfer DWBA calculations are in good agreement with experimental ones for previously well-known
states in 16 ^Ho and were therefore used for the analysis of 1 5 9 Ho data. Nuclear structure factors were
obtained for many levels and new Nilsson assignments
were made for the 3/2+[411], 5/2~[532] and 5/2+[413]
bands. The anomalous strengths of the strongly mixed
positive parity states in 5 9 ' 1 6 1 * 1 8 3 H o will be discussed in the framework of the Nilsson model with
pairing and effective Coriolis strengths included.
1)
Shahabuddin et al. Nucl. Phys. A307 (1978) 239.
42
WEDNESDAY, JUNE 18, 1980
ROOM BS B103
Chairman: D. Boal
9:00
EEl
PARTICLE AND NUCLEAR THEORY
INVITED
Implications of the Hot Big Bang for Particle Physics
P. Sutherland? McMaiteA UnlveAiity
Within the astrophysics community, the most commonly accepted cosmological model for the Universe
is the Hot Big Bang. Although apparently naive in its assumptions, the model is a good description
of the large-scale structure of the Universe and, specifically, attains its greatest success in
explaining the relative abundance of helium at the present epoch. These successes depend upon
inputs from nuclear and particle physics. Thus, to the extent that we accept the model, it can
be used to constrain theories of the elementary particles. I will review the conventional Hot Big
Bang model and discuss the implications it has for particle physics: the number of neutrino species,
the possible existence of neutral heavy leptons and massive hadrons, and mass and lifetime limits
for conjectured particles.
*Alfred P. Sloan Foundation Fellow
9:45
EE2
Conserved Quantities in Two and Four Dimensions
A. Chodos, Vale UnlveMity
Many field theories In one space and one time dimension are known to possess an infinite number of conserved
quantities (e.g. the Korteweg-de Vries (KdV) equation, the Sine-Gordon equation, the non-linear Schrodinger
equation, etc.). This property will be discussed in relation to other features of these equations: the
soliton property, factorization of the S-matrix, and the applicability of inverse scattering techniques. A
connection between conserved charges in the KdV and Sine-Gordon systems will be derived. Attempts to
extend these ideas to four dimensions will be discussed, including a scheme for generating conserved
quantities in non-Abelian gauge theories.
10:30
Break
10:45
EE3
Effective Nuclear Forces In the Quark Model with Delta and Hidden-Colour Channel Coupling
M. Harvey, Atomic EneAgy of Canada Limited
The advent of Quantum Chromodynamics has led to suggestions that a dominant part of the nucleonnucleon interaction arises from the color interaction between constituent quarks . We shall show
adiabatic potentials calculated in a six-quark cluster model for (TS)- (01) and (10) corresponding
to having NN, AA and CC (hidden color) channel coupling. Color-dependent quark-interactions are
used that yield the N and A resonances up to a mass of 2 GeV. Channel coupling is found to be
large (especially to the CC-state) and yields an effective NN-interaction having none of the characteristics of phenomenological potentials extracted from phase shifts. We surmise that the NNinteraction (including the hard-core) arises from the "sea" quarks (i.e. "mesonic" cloud) consistent with boson exchange models2.
1)
2)
11:30
EE4
D.A. Liberman, Phys. Rev. D16(1977)1542; C. DeTar, Phys. Rev. D17(1978)323.
F. Gross, Phys. Rev. D10(1974)223.
Molecular-like Phenomena in Heavy Ion Reactions
S. Kahana, 8.tookhaven National Labolatoly, Upton, New Yolk*
Recently, a striking phenomena has been observed in the investigation of elastic and inelastic
scattering at far backward angles for mass asymétrie heavy-ion systems. The relevant data
uncover déficiences in the present optical description of the ion-ion potential and consequently
are likely to provide a more refined understanding of this interaction. This phenomenon includes
(a) the observation of structure in the backward angular distributions for systems such as
I2
C +
Si and 1 6 0 + 2 8 Si, in particular a sharp rise in cross section at 180°; (b) the presence
of broad resonance-like structure in the elastic and inelastic excitation functions near 180°;
(c) the observation of similar structure in the energy dependence of a transfer reactions in
forward as well as backward directions. No model which describes all the features of the data
has yet been constructed, but a promising avenue has been opened directly connecting the
important features of the S-matrix with unusual aspects of the real ion-ion interaction. It is
clear the present data has uncovered a new degree of sensitivity in this interaction.
* Research performed under Contract No. DE-AC02-76CH00016 with the U. S. Department of Energy.
43
WEDNESDAY, JUNE 1 8 , 1980
ROOM SS 271
Chairman:
H.R. Glyde
9:00
EF1
Magnetic Excitations in the Random Ferromagnet
K E
.;ig>fa0 aXo.
- - LOCKE, C.V. STAGER, McMaster
University| and W.J.L. BUYERS, A.E.C.R.C.L, Chalk River
- The magnetic excitation spectrum of the randomly
diluted ferromagnet Ni2MnQ.8 v 0.2 S n has been measured by
neutron inelastic scattering techniques. The
frequencies are reduced from those observed for the concentrated ferromagnet KigMnSn by a factor that depends
on wavevector. This does not agree with a virtual
crystal model because of the influence of the local random environment. Computer simulation calculations have
been performed for large finite models (-10,000 spins).
Exact calculations out to "3rd n.n.'s show that it is
sufficient to treat the randomness of the l s t n.n.'s
exactly but to include interactions with further
neighbours in the virtual crystal approximation. This
nermits calculations on large spin arrays to be performed in reasonable times.
9:15
EF2
Phonons in Beta-Gallium: A Neutron Scattering
Investigation.
J.R.D. COPLEY, McMaster U., L. BOSIO
and R. CORTES, U. Paris VI, W.D. TEUCHERT*, TU MUnchen,
and J. LEFEBVRE, ILL Grenoble - The phonon dispersion
curves of monoclinic beta-gallium have been determined
for the 5 X (and S x ) , A, H z , S z and R directions, using
a three-axis neutron spectrometer at the Institut LaueLangevin high-flux reactor in Grenoble. The
measurements were made at the melting temperature,
256.8K. The crystal was grown and oriented in situ
owing to the metastable character of the 6 phase.
Unusual features of the dispersion curves will be
discussed, and the results will be compared with those
of Reichardt ej; al for the stable orthorhombic a
phase.
Hï. Reichardt, R.M. Nicklow, G. Dolling and H.G. Smith,
Bull. Am. Phys. Soc. JL4, 378 (1969).
•Present address:
Germany.
EXCITATIONS
9:45
EF4
Pressure Dependence of Elementary Excitations
in Normal Liquid 3 HiT H.R. GLYDE, Univ. of Ottawa, and
:'.C. KHANNA, Chalk River Nuclear Laboratories. — The
density and spin-density excitations in normal liquid
^He under applied pressure are described within a
simple RPA model employing the Landau quasiparticle
interaction. Damping of the zero-sound mode to
multi-quasiparticle-hole pairs is also included. The
zero-sound energy is predicted to increase markedly
with pressure while the quasiparticle-hole spectrum
energy decreases with pressure. The paramagnon mode
lemains largely unchanged. Damping of the zero-sound
mode increases with pressure. This increase coupled
with a decrease in coherent neutron scattering intensity
from liquid ^He suggests the zero-sound mode will be
difficult to observe at elevated pressures than at
zero pressure.
10:00
EF5
On the Contribution of Thermally Excited Quasiparticles to S($,m) in Superfluid '•He. A. GRIFFIN,
University of Toronto.—Woods and Svensson^ have shown
that S($,u0 in superfluid He can be separated into a
superfluid part Sg and a normal fluid part S^. We have
shown 2 , using the field-theoretic description of a Bosecondensed liquid, that the quasiparticle resonance w(Q)
exhibited by the singular part of S ( 5 , i d ) has a temperature-dependent weight proportional to the superfluid
density pg(T), exac tly as observed. As a continuation
of this work, we show that within the simple Bogoliubov
approximation, the regular part of the longitudinal
current-current correlation function splits into two
parts. One is due to the excitation of 2 quasiparticles
and is part of Sg. The other is due to scattering of
thermally excited quasiparticles and gives risetoSfj. It
is a broad continuum with a maximum at w(Q) and a weight
which scales as p^(T), as given by Landau's well known
expression for the normal fluid density.
Carl Zeiss, D-7082 Oberkochen, West
1.
2.
9:30
EF3
P r o t o n M a g n e t i c Resonance Lineshape Measurements
i n t h e Pal I adiurn Hydrogen System"
S.R. Kreitzmari~and
R . L . A r m s t r o n g . D e p a r t . P h y s i c s , U. o f T o r o n t o . The p r o t o n l i n e s h a p e i n PdH e x h i b i t s a t r i p l e peak
s t r u c t u r e w h i c h c o n s i s t s o f a b r o a d p a i r s p e c t r u m and
a narrow c e n t r a l component. The p a i r s p e c t r u m i s d i s cussed i n t h e c o n t e x t o f two m o d e l s . The f i r s t c o r r e sponds t o t h e o b v i o u s i n t e r p r e t a t i o n and l e a d s t o t h e
c o n c l u s i o n t h a t protons tend to c l u s t e r i n p a i r s i n
nearest neighbour o c t a h e d r a l - t e t r a h e d r a l s i t e s i n the
Pd l a t t i c e .
The second i s c o n c o c t e d t o be c o n s i s t e n t
w i t h t h e c u r r e n t view t h a t o n l y o c t a h e d r a l o c c u p a t i o n
occurs.
The b a s i c p o s t u l a t e i s t h e e x i s t e n c e o f s t r o n g
s c a l a r and i n d i r e c t d i p o l a r s p i n - s p i n c o u p l i n g w i t h i n
two m u t u a l l y e x c l u s i v e , i n t e r p e n e t r a t i n g s u b l a t t i c e s .
S p i n l a t t i c e r e l a x a t i o n measurements r e q u i r e t h a t e l e c t r o n i c s p i n d e n s i t y f l u c t u a t i o n s have a n t i f e r r o m a g n e t i c
c o r r e l a t i o n s among n e a r e s t n e i g h b o u r s w i t h i n each s u b lattice.
The shape o f t h e c e n t r a l component e x h i b i t s
a c o n c e n t r a t i o n dependence b u t a t e m p e r a t u r e i n d e p e n d ence.
T h i s component a r i s e s f r o m quantum m e c h a n i c a l
tunnelling.
The l i n e s h a p e u n a m b i g u o u s l y a s s o c i a t e s
t h e f e a t u r e w i t h p r o t o n exchange i n t h e Pd l a t t i c e .
A.D.B. Woods and E.C. Svensson, Phys. Rev. Letters
41, 974 (1P78).
A. Griffin, Phys. Rev. B19, 5946 (1979).
10:15
EF6
Anharmonic Effects in Aluminum. R.C. SHUKLA
and C.A. PLINT, Brock University - There are two sets
of measurements of the specific heat (C) of aluminum
from room temperature to the melting point available
in the l i t e r a t u r e ^ » .
The anharmonic contributions
extracted from the two sets show opposite signs. A new
analysis of the anharmonic contributions of these two
measurements of C will be presented and compared with
the theoretical anharmonic calculations based on the
first principle potentials derived by Taylor and
co-workers and Singwi et al., the phenomenological
Morse and Rydberg potentials and the Monte Carlo
method. There are indications that the theoretical
calculations support the positive and not the negative
anharmonic contributions to the specific heat at
constant volume reduced to 0°K.
^"C.R. Brooks and R.E. Bingham, J. Phys. Chem. Solids 29,
1553-1560 (1968).
2
A.J. Leadbetter, J. Phys. C I , 1481-8 (1968).
10:30
Break
44
10:45
EF7
Raman Spectra and Lattice Dynamics of Crystalline HF and DF.* A. ANDERSON, B.H. TORRIE AND W.S. TSE,
University of Waterloo - Raman spectra of polycrystalline samples of HF and DF have been recorded at 80 and
18 K. The observed features are compared to previous
infrared and Raman results on the hydrogen halides and
assignments of the fundamental modes are proposed. A
simple force constant model is used to describe the
normal modes of these crystals. Relatively strong
hydrogen bonds are found within the zig-zag chains of
the orthorhombic structure, but the forces between
layers of molecules are surprisingly weak.
•Supported by grants from NSERC.
11:30
EF10
Elastic and Photoelastic Constants of L1F and
KBr. H. BRAUL and C.A. PLINT, Brock University Measurements of the elastic and photoelastic constants
of LiF and KBr by Brillouin spectroscopy are reported.
Scattering from the longitudinal, transverse and mixed
modes was observed for each material over a significant
range of phonon wave-vectors in the (110) plane. The
elastic constants are in very good agreement with the
ultrasonic values; dispersion effects^) are not confirmed. Photoelastic constants were measured by comparison with benzene and are the first measurements for
these materials by Brillouin spectroscopy. For LiF the
results are a significant improvement on the ultrasonic
data. For KBr: c^-35 . 1±0.2, c,,=6.1±0.4, c.,=5.1±0.1
12
44
(GPa); p n =0.22±0.03, p12=0.171±0.013, P44=-°-019+0.002.
For LiF:
c n =113.5+0.9, c.^-47+2, c 44 =62.9+0.6 (GPa);
P u =0.032+0.005, p12=0.137+0.012, p44=-0.051±.008.
11:00
EF8 Final State Interactions and the Raman Spectrum
of Solid Argon. E.R. COWLEY and G.K. HORTON, Rutgers
University - Recent calculations1of the two-phonon
Raman scattering from solid Argon, show that even at
low temperatures and under conditions where the phonon
spectrum is well-known from neutron scattering experiments, there are significant discrepancies between
theory and experiment. It is suggested that these
arise from anharmonic interactions between the two
phonons created in the scattering process. For a
one-dimensional crystal the Raman spectrum is calculated analytically both including and without the
interactions, Numerical results for the three-dimensional case are described.
J.G. Leese, G.K. Horton, and E.R. Cowley, J. Low Temp.
Phys. 36, 347 (1979).
11:15
EF9
Elastic Constants of hep and fee Ar Crystals
Doped with Op as Impurity. S. F. AHMAD, H. KIEFTE and
M. J. CLOUTER, Memorial University of Newfoundland Elastic constants have been obtained for hep and fee
phases of Ar single crystals with various percentages of
0g impurity. High resolution Brillouin spectroscopy
was used to observe the sound velocity in various
directions of the crystals. Elastic constants of hep
Ar-6.5* 02 were found to be (in 109 N m - 2 ) C n = 2.91,
Ci2 » 1.52, C13 » 1.19, C33 = 3.2U, and Cl+U = 0.655,
with an estimated error of better than 2 C o m p a r i s o n
of appropriately transformed fee and hep elastic
constants indicate good agreement, however the hep C13
is anomalously higher than the fee value. This effect
will be interpreted.
Kaplan et al. Phys. Lett. 31A, 201 (1970), Phys. Rev.
Lett. 24, 827 (1970).
11:45
EF11
Brillouin Spectroscopy in Ice Ih ; Crystal Grain
Boundary Observations. P. H. GAMMON, H. KIEFTE,
M. J. CLOUTER and W. W. DENNER, M;morial University of
Newfoundland - Brillouin spectroscopy has been used to
study the acoustic properties of samples of ice Ih
formed in the natural environment. Significant among
the results has been the observation of a marked ji
assymetry in spectra obtained from the grain boundary
region of a bicrystalline ice sample. These
observations will be discussed.
12:00
EF12
Phonon spectra of Mono-layer Methane Adsorbed on
the Surface of Graphite. K. Makl and M.L. Klein, Inst.
Mat. Sci. McMaster Univ.—The phonon frequencies are
calculated in the framework of self-consistent harmonic
approximation. The positional order of molecules is
assumed to be the ./JxvT registered structure. The
orientational order is assumed to be the stable tripod
structure on the basis of the investigation of the
two-dimensional octopolar array^-1. Only three degrees
of freedom per molecule are taken into account: i.e.
translation parallel to the surface (2) and rotation
about the axis normal to the surface (1). Methanegraphite interaction is discarded, and a new intermolecular potential proposed by Righini and the present
authors is employed. It is found that the translation—
libiation coupling plays an important role in the
anharmonic effect on the frequencies. The result is
compared with the incoherent neutron scattering
experiment by Bomchil et al. The two main peaks at 9
and 5 meV are assigned to librational and translational
modes, respectively.
1) K. Maki and S. Nosé, J. Chem. Phys. 71, 1392 (1979)
and S.F. O'Shea and M.L. Klein, ibid. TT, 2399 (1979).
WEDNESDAY, JUNE 1 8 , 1980
ROOM SS 164
Chairman: J . E . Kitchlng
HIGH SPIN STATES
9:00
EG1
Quasiparticle Angular Momentum Alignment in Rotating Nuclei
J.C. Waddington, UcMaiteA UniveAAlty
A sudden change In the rotational spectra of rotating nuclei is known as backbending. It is
understood to result from the crossing of bands of different degrees of rotational alignment.
For example, the S band crosses the ground state band in the rare earth region. The extra
alignment of the S band results from a pair of 1^3/2 neutrons. This paper will describe
(H.I.,xn) experiments which populated states in neighbouring even-even, odd-neutron, odd-proton
and doubly-odd nuclei near Z«70, N*=90. A simple model for understanding these data will be
presented. It will be shown that it is possible to understand the frequencies at which band
crossings occur and the gain in alignment at these crossing in terms of the properties of the
quasiparticles involved.
45
9:45
EG2 A study of the I M Sm(1 *N,3n)1 5 9 Tm Reaction.*
A.J. LARABEE and J.C. WADDINGTON, McMaster Universlt •
Hamilton—The yrast bands of '||Er and '$$Yb are both
known to have a second backbend. The first backbend is
caused by the alignment of two 1^3/2 particles with the
rotational angular momentum of the core. It has been
proposed that the second backbend results from the further alignment of a pair of hjj/2 protons. In order to
investigate this possibility, tne
band in 'ffTm
is being studied. By determining the alignment of this
band in 'IfTm, the crossing in 'leEr and 9 °Yb may be
predicted.
In order to accentuate the highest-spin states in
the ll,eSm(ll'N,3n)1 5 9 Tm reaction, the coincident y-rays
detected in three Ge(Li) detectors have been gated by
the detection of further y-rays in a multiplicity filter.
This filter consists of an array of 7 Na(I) detectors
with a total efficiency x solid angle of % 39%. Excitation functions, y-y coincidence data and angular distribution data have been collected using the multiplicity filter to increase the sensitivity to high-spin
events. Gamma-rays with the energies 166.9, 209.3,
231.6, 281.8, 331.3, 462.0, 558.7 and 629.3 keV have
been assigned to f|Tm.
* Supported by NSERC
10:00
* Project supported by NSERC grant IEP-11
t Work supported by U.S. Department of Energy contract
W-7905ENG48.
11:00
EG6
Deuteron photodisintegration with the LAPON beam. W.
DEL BIANCO, and H. JEREMIE, U. de Montreal, L. CASANO,
M. DE PASCALE, L. FEDERICI, S. FRULLANI, B. GIROLAMI,
G. GIORDANO, L. INGROSSO, G. MATONE, M. MATTIOLI, G.
PASQUARIELLO, G. PELFER, G. PICOZZA, E. POLDI, D. PROSPERI, C. SCHAERF, Labor. Nazionali Frascati. - The deuteron photodisintegration is being investigated with the
linearly polarized monochromatic y-ray beam recently developed at the Italian National Laboratory in Frascati.
The experimental set-up is the same as that used in a
previous experiment1'. The quantity 3(6)
I 1 (8)/I 0 (6)
has been determined at 9 = 90 and at y-ray energies from
pnotoneutron yields at 0 = 90 and 0 = 0 .
Preliminary
results appear to be in fair agreement with Partovi's
2
calculation ).
Break
10:15
EG3
High Spin States in Light Sn Isotopes?
R. TACIK, J.E. CRAWFORD, G.L. GILES, J.E. KITCHING,
B.J. VARLEY, McGill University - (a,xny)reactions have
been carried out on 1 *"Cd and l o e Cd targets using a
stretched beam from McGill1s synchrocyclotron at bombarding energies between 54 and 95 MeV.
y-y
coincidence and angular correlation experiments have
been carried out. Level structures and spin assignments will be discussed within the context of IBA.
* Work supported by NSERC.
10:30
141
Pm.
G.L.
EG4 High S p i n S t a t e s i n
GILES, J . E . CRAWFORD, K.E. KITCHING, R.
TACIK and B . J . VARLEY, M c G i l l U n i v . - - I n beam
( o , x n r ) r e a c t i o n s have been c a r r i e d o u t on a
1 4 1 p r t a r g e t a t bombarding e n e r g i e s between
50 and 75 MeV.
y-y c o i n c i d e n c e and a n g u l a r
c o r r e l a t i o n e x p e r i m e n t s have been done.
The
l e v e l s t r u c t u r e and s p i n a s s i g n m e n t s w i l l be
discussed .
*Work s u p p o r t e d
muonic K a X rays are 0.125±0.023 for 2 35 U and 0.062 ±
0.013 for Z 3 9 U . The prompt-to-delayed fission yield
ratios are 0.138 ± 0.009 for 2 3 5 U and 0.089 ± 0.017 for
238
U . The mean lifetimes for fissions following a muon
storing were 71.5 ± 0.9 ns in 2 35 U and 76.0 ± 1.3 ns
in
by NSERC, Canada
10:45
Fission Yields and lifetimes for Muon Induced
EG 5
Fission in z 3 b U and
°U*. S.AHMAD, G.A.BEER, G.R.
MASON, A.OLIN, R.M.PEARCE (University of Victoria); J.A.
MACDONALD (TRIUMF); M.S.DIXIT (NRC); O.HAUSSER(CRNL);
S.N.KAPLANt(Universlty of California at Berkeley) Measurements have been made of the delayed fission yieltfe
er captured muon using multiplate fission chambers of
U and 2 3 e U . In addition to p-induced fissions, X rays
from the cascade of muons captured by uranium nuclei
were detected
using a large volume Ge(Li) detector.
Fission chamber and Ge(Li) pulse heights as well as timing information referenced to y stops detected with a
standard scintillator telescope were recorded. The measured yields of the delayed fissions in coincidence with
?
Del Bianco, H. Jeremie, M. Irshad and G. Kajrys
B.A.P.S. 24 (1979) 648.
2
F. Partovi, Ann. of Phys. 27 (1964) 79.
11:15
EG7 High-Resolution Photofission Using a Bremsstrahlung
Monochromator *B.O. PICH, S. YEN, T.E. DRAKE,
U. of Toronto, J.W. KN0WLES, CRNL, R. GULBRANSON,
L. CAKDMAN, U. of Illinois .- High-resolution photofission studies of actinide nuclei are in progress
using the Chalk River Bremsstrahlung Monochromator, recently set up at the University of Illinois ElectronMicrotron Laboratory. The performance of the monochromator, as well as a measurement of the 2 3 2 T h (y,f)
cross section, will be discussed. A complementary
232
T h (y,y) measurement is presently under way using
the Compton Spectrometer at the NRU reactor at Chalk
River.
* Work supported by NSERC, AECL and N.S.F.
11:30
EG8 Photoneutron Angular Distributions in Lead 206 and
208; Evidence for Photon Multipole Mixing. J.N. BARKMAN,
T.J. KENNETT and W.V. PRESTWICH, McMaster University Measurements were made of the neutron angular distributions in the (y,n) reaction of separated lead isotopes.
Monochromatic photons were obtained by neutron capture
in nickel and chromium in the core of the McMaster
Nuclear Reactor, and a collimated beam was obtained
using a beam port facility. The photoneutrons were
detected at angles from 20 to l60 degrees with respect
to the beam axis with a high resolution Helium-3 ionization chamber. Angular distribution functions were
deduced for all observed transitions. Since the spins
of the target nucleus and the levels in the residual
nucleus were known, comparisons could be made to the
theoretical expansions of the angular distribution coefficients in terms of the (y,n) reaction channel amplitudes. Using optical model predictions of the neutron
transmission probabilities for the neutron emission
channel amplitudes, and hard sphere neutron scattering
predictions of the interference phase factors; a measure
of the amount of E1-E2 mixing was obtained at several
photon energies below the giant dipole resonance. Significant E2 contributions were inferred from measurements.
WEDNESDAY, JUNE 18, 1980
HEALTH SCIENCES CENTRE, ROOM 1K8
12:00
Luncheon Meeting of CAP Executive and Divisional Representatives:
Discussion of "Study of Future Research Opportunities in Physics.
46
PLENARY SESSION:
WEDNESDAY, JUNE 18, 1980
ROOM Burke Science Auditorium
Chairman: P. Marmet
13:30
FA1
14:15
FA2
The Future of Nuclear Energy
A.M. Weinberg, InitlXate fol EneAgy
THE FUTURE OF NUCLEAR ENERGY
Analysis
Nuclear Energy: Trans-Science is not Enough
J.A.L. Robertson, Chalk RlveA HucleaA
Laboiatoliei
In the early 1970s Alvin Weinberg introduced the term trans-science. At that time it was necessary
to remind the technical community that certain political decisions, such as how to dispose of
nuclear wastes, involve matters of opinion and not just matters of scientific fact. Since then,
with the rise of para-science and even anti-science, the pendulum has swung to the opposite
extreme. Now it is time to appeal for political decision making to take into account available
scientific facts and not just emotional arguments.
In nuclear energy, questions of uranium
mining, reactor safety and waste management can benefit from application of the scientific
method. Value judgements still have to be made but they should be based on sound factual
foundations.
In the current debate over Canada's energy future uncommitted members of the
scientific community can play a valuable role by assessing the technical arguments and
interpreting the subject to other members of our society.
14:40
FA3
Health Effects of Nuclear Power
A.M. Marko, Chalk RlveA HucleaA Labonatoliei
The sources and levels of natural and man-made radiation are described.
The relationship
between dose and health effects, such as radiation-induced
cancer
and hereditary
defects
is outlined; this relationship is used to illustrate the derivation of radiation protection
standards and current risk estimates of health effects caused by radiation. The risks to
occupational workers and to the public will be compared to risks of other industries and
alternative energy sources.
15:05 - 15:30
15:30
Discussion
Break
WEDNESDAY, JUNE 18, 1980
ROOM Burke Science Auditorium
Chairman: P.A. Forsyth
15:45
FB
Presidential Address
P.A. Forsyth, President of CAP, UnlveAilty of WeiteAn OntoAlo
and
Annual General Meeting of the Canadian Association of Physicists
WEDNESDAY EVENING
Reception and Banquet
18:00
Tour of Hamilton Art Gallery
18:30
Reception:
19:30
Banquet: Studio Theatre of Hamilton Place
Presentation of CAP Awards
N.B. Bus transportation from the Commons Building at 17:30 and 18:00
Hamilton Art Gallery, hosted by McMaster University
and the City of Hamilton
47
THURSDAY, JUNE 19, 15
ROOM SS 102
Chairman:
R. Enns
9:00
GA1
CONDENSED MATTER THEORY
INVITED
Theoretical Models of Biological Membranes*
D. Pink, St. Francis XavleA UnlveAilty
A brief description of the structure of biological membranes and their relation to lipid bilayers
will be given and the mechanism and consequences of bilayer "melting" will be identified. A model
will be presented which will be used to (a) understand aspects of the "main" phase transition in
pure lipid bilayers, (b) construct phase diagrams of bilayers composed of lipids and cholesterol,
polypeptides or proteins, and (c) calculate specific heats, heats of transition, deuterium magnetic
resonance quadrupole splittings, relative Raman intensities, and trans-membrane and lateral diffusion
rates. Comparison with experiments will be made. Finally, the model will be simplified and results
of (d) Monte Carlo studies of clusters and (e) exact calculations of some critical exponents will be
presented.
•Supported by NSERC of Canada and the UCR, St. F.X. University.
9:45
GA2
10:30
GA3
Localization and Interactions in Two Dimensions
P.A. Lee, Bell Telephone Laboratories
Spin Glasses
B. Southern, UnlveAilty of Manitoba
During recent years a new descriptive term has entered the vocabulary of magnetism: 'spin glass'.
Spin glasses are magnets in which there exists some competition between the different interactions
due to some disorder in the system. No conventional long range order can occur but a transition
to a randomly frozen spin state is believed to take place. However, the nature of this transition
and the frozen state which appears are the subjects of much debate. A brief outline of the problem
is presented.
11:15
GA4
Superconductivity in the A15 Compounds
J.P. Carbotte, McMaiteA UnlveAilty
THURSDAY, JUNE 19, 1980
ROOM SS 164
Chairman: A.D. May
9:00
GB1
The S t a t u s o f CSRF, The Canadian S y n c h r o t r o n
Radiation F a c i l i t y *
J.WM. MCG0WAN, G.M. BANCROFT,
The U n i v e r s i t y o f Western O n t a r i o
A Canadian s y n c h r o t r o n r a d i a t i o n f a c i l i t y has been
designed f o r the new " A l a d d i n " s y n c h r o t r o n r a d i a t i o n
source a t the P h y s i c a l Sciences L a b o r a t o r y , U n i v e r s i t y
o f Wi s c o n s i n . A l r e a d y the s t a f f has been i d e n t i f i e d
and the h i g h r e s o l u t i o n g r a i s i n g i n c i d e n c e
" g r a s s h o p p e r " monochromator has been d e l i v e r e d and
tested.
The monochromator w i l l f u n c t i o n over t h e
energy i n t e r v a l 10-500 eV. Three experiments a r e
a l r e a d y scheduled f o r t h e f a c i l i t y - o.ie on photoe l e c t r o n s p e c t r o s c o p y , a second on s o f t x - r a y
l i t h o g r a p h y r e l e v a n t t o a s t u d y o f b i o l o g i c a l c e l l s and
m i c r o c i r c u i t s and a t h i r d d e a l i n g w i t n subnanosecond
l i f e t i m e s of excited organic molecules.
The t h i r d
experiment w i l l use a 1 meter vacuum monochromator
designed f o r the energy i n t e r v a l l - 1 0 e V . Both monochromators w i l l be a v a i l a b l e i n the f u t u r e f o r o t h e r
experiments.
ATOMIC PHYSICS
9:15
GB2
Development o f ME I BE-11 f o r S t u d i e s o f D i e l e c t r o n i c
Recombination*
P.MUL, J . B . A . MITCHELL, A. SEN, C.NG,
C . J . KAISER, H.R. FR0ELICH, J.WM. MCG0WAN, The
U n i v e r s i t y o f Western O n t a r i o .
Our second merged e l e c t r o n - i o n beam apparatus i s now
nearing completion.
I n t h i s r e p o r t we d e s c r i b e the
c o m b i n a t i o n o f o l d / n e w t e c h n o l o g i e s t h a t should make
i t p o s s i b l e f o r us t o measure c r o s s - s e c t i o n s 5-6 o r d e r s
o f magnitude s m a l l e r than the d i s s o c i a t i v e
r e c o m b i n a t i o n c r o s s - s e c t i o n s a l r e a d y thus f a r s t u d i e d
i n our l a b o r a t o r y .
Our source o f ions i s a 0 . 5 mev
van de G r a a f f .
As the ions pass through the i n t e r a c t i o n
r e g i o n ( p r e s s u r e 1 0 " ! ' T o r r ) they a r e chased by
e l e c t r o n s produced i n a P i e r c e t y p e gun.
These
e l e c t r o n s a r e superimposed on the i o n beam i n a manner
s i m i l a r t o t h a t developed f o r MEIBE-I.
Our p r i n c i p l e
i n t e r e s t i s i n processes such as d i e l e c t r o n i c
r e c o m b i n a t i o n , an atomic process i n f u s i o n plasmas which
accounts f o r plasma c o o l i n g .
•Supported by U.S. DOE and NSERC
* Supported by NSERC, NRC and U n i v e r s i t y o f Western
O n t a r i o t h r o u g h i t s Academic Development Fund.
48
9:30
GB3
Energy-dispersive Measurements of Kr, X-ray Llnewidths
and Relative Intensities.* C. W. SCHULTE and J. L.
CAMPBELL, Dept. of Physics, U. of Guelph - The intrinsic
llnewidths T and component intensity ratios are
determined via Ge(Li) spectroscopy for K a doublets at
high Z. Spectrum fitting techniques employ two
different approaches to convolute the intrinsic
Lorentzian profiles with detector resolution function.
The forbidden KC13 transition is seen in Ge(Li) spectra
for the first time. The results, together with older
data from crystal diffraction spectroscopy, are compared
with Scofield's RHF predictions, and the present work
is found to be in better agreement with theory.
*
10:30
GB7
Theory of Spin Exchange Scattering and
Recombination in Low Temperature Gaseous Atomic
Hydrogen.* A.J. BERLINSKY, Physics Dept., University
of B.C. - A theoretical discussion is presented of
the scattering processes which determine spin relaxation, diffusion, and recombination rates for a low
temperature atomic hydrogen gas. In particular, the
low energy limits for H-H spin exchange and for H^He diffusion cross-sections are considered and the
possible effects of low energy H-H orbiting resonances are described.
Supported by NSERC
Supported by NSERC.
9:45
GB4
Equivalent Electrons and Basis States f o r
U(2£+l ) x SU(2). VI. R. ROSS, Univ. of New Bruïïlwick The Slater basis states for n equivalent electrons
gives us the basis states for the antisymmetric irreduc i b l e representation [ l n ] of U(4Jl+2). When we consider
the subgroup U(2£+l) x SU(2) we obtain states which are
eigenstates of the t o t a l spin. We w i l l give a general
expression f o r the basis states of U(2S,+i) x SU(2) in
terms of the anti-symmetric states of U(4£+2).
10:00
GB5
Multiconfiguration Optimized Potential Model
Calculation for Atomic Mg.* K. AA5HAMAR, T.M. LUKE and
J.D. TALMAN, U.W.O.-An effective potential model for
atoms that has recently been developed' has been applied to calculate energy levels and oscillator strengths for the Mg atom. The calculation is a multi-configuration type which uses radial orbital s that are obtained from a variational derived central potential, or
H-dependent central potential. The results of the
ground state wave function calculation are in very good
agreement with the MCHF results of Froese Fischer2. It
is also possible to perform the variational calculation
for weighted averages of ground and excited state energies, and excellent agreement with experimental term
separations and oscillator strengths have been obtained.
'K.Aashamar, T.M. Luke and J.D. Talman, J. Phys. B., 12,
.3455 (1979).
-C. Froese Fischer, Can. J. Phys., 53, 101, 321 (1975).
•Supported by NSERC and U.W.0. Centre for Chemical
Physics.
10:15
GB6
Density Functional Theory Applied to Atomic
Quadrupole Polarizabilities and Shielding Factors •
D. ZOBIN, E. ZAREMBA and M.J. STOTT, Dept. of Physics,
Queen's U., Kingston. - A linear response formulation 1
of density functional theory has been employed for calculating quadrupole polarizabilities and shielding
factors for a number of closed shell atoms and ions.
Application of the method to this problem involves the
change in charge density induced by an external electric
field gradient. This has been calculated self-consistently by solving an integral equation whose kernel is
the density response function for the atom. The calculations were performed in the local density approximation, Except for He the results are in good agreement
with coupled Hartree-Fock and Configuration Interaction
calculations where these are available. These results
and results for heavier atoms will be presented.
'Stott M.J. and Zaremba E., Phys. Rev. A21, 12 (1980).
Work supported by the NSERC of Canada.
10:45
GB8
Lamb Shift in 7 L 1 + by Laser Spectroscopy.* R.A.
HOLT, S.D. ROSNER, T.D. GAILY and A.G. ADAM, Univ. of
Western Ontario - We have measured the absolute wavenumbers of the 2s 3 S 1 — 2 p 3 P j transitions in 7 L i + by laser
fluorescence spectroscopy on an ion beam. Using the hfs
theory of Jette, Lee, and Das, we have extracted the
following hfs-free wavenumbers:
O(2S3SI—2p3Po)*
18 231.3030(12) cm" 1 , 0(2s 3 S 1 — 2 p 3 P i ) = 1 8 226.1082(12)
cm" 1 , o ( 2 s 3 S 1 — 2 p 3 P 2 ) = 1 8 228.1979(12) c m - 1 .
By subtracting the theoretical values of Accad, Pekeris, and Schiff,
wo obtain the differential Lamb shifts: J < f , (2s 3 Si—2p 5 Po)1.2539(16) cm" 1 , i^(2s 3 Sj—2p 3 Pj)=l.2543(16) c m - 1 ,
,
3
3
1
These results are in
s j v'2s Si—2p Pî)=l.2545(16) cm" .
agreement with the calculations of Ermolaev and with
earlier measurements by Bacis and Berry. The fine
structure intervals obtained from the absolute wavenumbers are in agreement with the theory of Accad et al.
and with the measurements of Bacis and Berry, but they
exhibit a disagreement, which amounts in one case to 20,
with the recent more precise results of zu Putlltz and
coworkers.
•Supported by NSERC and the Univ. of Western Ontario
11:00
GB9
E_l ectron Temperature Dependence of Collision
Parameters in Noble Gases. P. BAILLE, U. West. Ont., J.
S. CHANG, McMaster, R.M. H0BS0N, York, G.L. 0GRAM, U. of
A. YAU and A. CLAUDE, Herzberg I.A.-The low energy
theoretical elastic cross-sections computed by YAU et
al'>2 with polarized orbital local exchange methods for
the noble gases
is used to obtain temperature dependences of the mean free paths, effective collision frequencies, mobilities and diffusion coefficients assuming
a Maxwellian distribution. Approximate analytical formulae are also developed. The results are compared with
other theoretical and experimental data3.
'Yau A.W., McEachran R.P. and Stauffer A.D., J. Phys.B.,
11.
2yau
11,
311 i
2907 (1978).
A.W., McEachran R.P. and Stauffer A.D., J. Phys.B.,
377 (1980).
kawa Y., Phys. Fluids, 16, 031 (1973).
49
SEMICONDUCTORS
THURSDAY, JUNE 19, 1980
ROOM SS 163
Chairman: J . Brebner
9:00
GC1
Yb2V207: A Ferromagnetic Semiconductor.
L . SODERHOLMt J.E. GREEDAN and M.F. COLLINS, McMaster
University - Compounds which are simultaneously ferromagnetic and semiconducting are rare. Yb2V207 was
recently reported (1,2) to fall into this category
however the evidence supporting ferromagnetic behavior
was ambiguous. Our measurements give a saturation magnetization of 5.3 *_ 0.1 pg/f.u. Neutron diffraction
powder data at 100K is consistent with paramagnetism
while at 7K the pattern indicates ferromagnetism. If a
vanadium moment of 0.94 yg is assumed (3), the moment
obtained for Yb + 3 is 1.70 + 0.2 pg. This reduced
moment (free ion = 4 . 0 pg) may result from a strongly
axial crystalline field. MBssbauer data support this
argument.
(1)
G.V. Bazuev, Akad, Nauk SSSR £30:
869 (1976).
(2)
T. Shin-ike, Mat. Res. Bull. 12; 1149 (1977).
(3)
L. Soderholm and J.E. Greedan, Mat. Res. Bull. 14:
1449 (1979).
9:15
GC2
A Metal - Semiconductor Transition in LaTi03 and
CeTi03? J.E. GREEDAN and D.A. MACLEAN, Inst, for
Materials Research, McMaster University - Electrical
resistivity and magnetic susceptibility data for single
crystal samples of the relatively new materials, LaTiOj
and CeTiOj, suggest a metal - semiconductor transition
with temperature for both compounds. For LaTiOj the
resistivity shows a metallic temperature dependence down
to 125K. Below 125K the resistivity increases exponentially with an activation energy of - 0.01 eV. The
magnetic susceptibility shows a temperature-independent
Pauli susceptibility above 125K while below this temperature a weak spontaneous magnetic moment (- 0.01 pg)
appears. The data for CeTiOj are similar except that
the onset of activated resistivity at 60K is not correlated with the onset of magnetic order at 95K Qualitative models for this behavior will be discussed.
9:30
GC3
Conductivity Measurements on Polycrystalline
Hydronium Beta" Alumina - A Fast Proton Conductor.
A. TEITSMA, M. SAYER and S.L. SEGEL, Queen's U.
Kingston, Ont, and P.S. NICHOLSON, McMaster U.
Hamilton, Ont. - A.C. conductivity measurements on polycrystalline hydronium (3" alumina using reversible
electrodes resulted in bulk conductivities in agreement
with single crystal results1 (7-9 x 10 3 n - 1 c m _ 1 at
23°C). Measurements over the temperature range 23°C to
200 °C resulted in an activation energy of 0.19 ev. DTA
indicates water loss at ^ 170°C while NMR studies showed
high proton mobility.
Harrington, G.C. and Briant, J.L., Mat. Res. Bull.,
13, 763 (19T8).
9:45
GC4
Cu
In S
(1-y)2(l-x)—2x
Prototype of the Pentenary Chalcopyrite Semiconductor
systems* G.H. CHAPMAN and B.K. GARSIDE, McMaster U. The group III-V mixed quarternary alloy semiconductors,
such as GalnAsP, have been employed in lattice matching
different semiconductor layers (at specified bandgaps)
to form heterojunction electro-optical devices. The
feasibility of employing the analogous pentenary alloys,
obtained from ternary chalcopyrite groups I-III-VI,»
has been explored using the five element mixture
Cu,. .Ag InS,,. . Se. as a prototype.
(1-y) y
2(l-x) 2x
The pentenary alloys would generate a wider range of
direct bandgap - lattice matching possibilities than the
III-V's. In initial tests the prototype was produced
using the reaction of stoichimetric powder mixtures.
X-ray diffraction techniques measured a sample's lattice
values while cathodoluminescence spectrum determined the
the direct bandgaps at 77 and 300 K. Interesting
results were obtained with single crystals of this
system. Preliminary work has been done on other
pentenaries covering the 1.0 to 0.5 eV range of interest
for fiber optic system detectors and sources.
* Supported by the National Research Council
10:00
GC5
Characteristics of a Te-Se-Cd Structure. C.H.
CHAMPNESS and M. El AZAB, Dept. of Elec. Eng., McGill
University, Montreal.- A Te-Se-Cd structure was fabricated by evaporating successively first Se and then Cd
on to a monocrystalline Te substrate. Following this,
"forming" was carried out by the prolonged passage of a
reverse current. Study of capacitance-voltage characteristics has indicated that the "forming'' action is
likely to be a depopulation by ion-drift of the acceptors
in the Se close to the interface with the Cd. If the
"forming" is done with only low joule heating, no CdSe
is detectable at the Cd-Se interface by S.E.M. observation. However, if heating is involved, CdSe is clearly
created. In the reverse direction of the Te-Se-Cd
devices, the current at higher voltages (VR) is greatly
reduced with pulsed operation than with d.c. This, and
the observed variation of capacitance with frequency
indicates a high concentration of slow traps. The
reverse p u l ^ d current is found to vary approximately
as (V
, with n ranging from 2 to 3, which is
qualitatively consistent with Schottky barrier lowering.
10:15
Break
10:30
GC6 Minority Carrier Lifetime near Grain Boundaries
in Polycrystalline Silicon.* GARY D. ROBERTS, A.E.
DIXON and I.R. DAGG, Department of Physics, University
of Waterloo - Minority carrier lifetime in single
crystal silicon wafers has been measured by a reflected
microwave technique.^ This paper discusses measurements of minority carrier lifetime near grain
boundaries in polycrystalline silicon wafers. Excess
carriers are generated using a focused, pulsed light
source. Microwaves are continuously directed at the
wafer, and the reflected microwave power is measured.
Since the reflected microwave power is proportional to
the carrier concentration, the minority carrier lifetime can be calculated from the reflected microwave
decay curve. Results for neutron transmutation doped
Czochralski silicon and for commercially available
silicon wafers are reported.
1
Mada, Yoichi, Jpn.J.Appl.Phys., 18, 2171(1979)
A
Supported by N.S.E.R.C.
10:45
GC7
Elec tron Drift Mobility of rf Sputtered Amorphous Si-H Alloys^
P. JACQUES*, J.L. BREBNER*, D.A.
ANDERSON** and WILLIAM PAUL** - The drift mobility of
electrons has been measured as a function of temperature
in a-Si prepared by rf-sputtering. Samples were deposited at T = 200°C and contain approximately 15 at 1 hydrogen. Current transients were recorded with a memory
scope and transit times determined by numerical differentiation rather than the asymptotic procedure suggested
by Scher and Montroll (1). Though the transients show
clearly a dispersive behaviour, the reciprocal of transit time has a linear dépendance over voltage. In the
temperature range 215K to 425K the mobility varies from
8 x 10"3 to 10"1 cm 2 V" 1 ST- and exhibits two transport
mechanisms with activation energies of 0,18eV and 0,08eV
the lower energy mechanism being the dominant one.
+
*
**
Subventionné par CRSNG et Ministère de l'Education
du Québec
Département de Physique, Université de Montréal
Physics Department, Harvard University
(1) H. Scher and E.W. Montroll, Phys. Rev. B., .12,
2455, (1975).
50
11:00
11:15
GC9
Microwave Conductivity o'f K TCN0~ . J.-L.
GOUDARD, AMIR A. LAKHANI, Dep. de physique. U. de
Sherbrooke and N.H. HOTA, Dep. de chimie. C.M.R.
St-Jean. - Using a perturbation method of a microwave
cavity, we measured real and imaginary parts of the
dielectric constant ( E l - je 2 ) at 9.6 GHZ of K TCNQ - ,
a one dimensional semiconductor which is known to exhibit a spin-Peierls phase transition at 396 K. The
phase change is accompanied by an increase of about
40% in the conductivity. Discrepency was found between activation energy in DC [E — .35 eV (.22 eV) in
low (high) temperature phase] anâ "10 GHz" measurements
[E = .25 eV (.13 eV)], that suggests an activated
mobility process (due to interrupted chains) in DC
measurements. Two batches of crystal have been studied
with two different room temperature conductivities.
Results were similar although the more conductive
group showed a great sensitivity to thermal cycling.
No change was observed in the dielectric constant
(ej - 5.8 ± .4) at the transition temperature.
GC8
The Electrical Conductivity of DEM(TCNQ)?* J.F.
CAROLAN, Univ. of Brit. Col, and G.A. SAWATZKY, Univ.
of Gronlngen, the Netherlands. - - Diethyl Morpholinium
(DEM) - (TCNQ)2 has two TCNQ stacks oriented at 60° to
each other which are crystallographically inequivalent.^
The electrical conductivity has been measured from 20°C
to 240 C in several directions to attempt to observe
differences in the conductivity due to the different
TCNQ stacks. An anisotropy is observed in the conductivity especially at the phase transition at 145°C.
These results will be discussed in relation to recent
ESR results.2
»A. Vof and B. van Bodegom (to be published)
2
C.F. Schwerdtfeger and G.A. Sawatsky, Bull. Am. Phys.
Soc. 25, 217 (1980).
•Supported by NSERC.
THURSDAY, JUNE 19, 1980
ROOM SS 165
: 00
GD
Workshop on "Study of Future Research Opportunities in Physics"
Divisions of Nuclear and Particle Physics
THURSDAY, JUNE 19, 1980
HEALTH SCIENCES CENTRE, ROOM 1K7
12:00
CAP COUNCIL
Chairman:
C.C. Costain
AUTHOR INDEX/INDEX DES AUTEURS
Aashamar, K.,
GB5
Adam, A.G., GB8
Ahlborn, B., AC2; CB1
Ahmad, S., EG5
Ahmad, S.F., EF9
Alcock, A.J., BD4; EB3
Anderson, A., EF7
Anderson, D.A., GC7
Anderson, H.L., AD5
André, H., BH1
Andrews, H.R., DEI
Antoine, P. CB3
Armstrong, R.L., EF3
Arrott, A., DAI
Austen, D., CE2,3
Axen, D., DDI
Azuelos, G., AD5
Azuma, R.E., AE1
Bâcher, A.D., DD2
Ballik, E.A., BD5
Bancroft, G.M., GB1
Barak, Z., AG6
Barber, H.D., AA2
Baribeau, J.M., DF2
Barkman, J.N., EG8
Barrie, R., EA1
Batalla, E., BB5
Bederson, B., EC1
Beer, G.A., AD5; EG5
Bélanger, P.A., CF1
Berezin, A.A., BG6; CG4
Berlinsky, A.J., BB3; GB7
Bharaj, B., CH3
Baille, P., GB9
Blecher, M., AD5
Bolton, R.A., BC5,7
Bosio, L., EF2
Bouchard, C., DF4
Boucher, C., BC2
Bourbonnais, C., CG2
Braul, H., EF10
Brebner, J.L. BG4, GC7
Bricault, P., DD3
Brizard, A., BC8
Brodie, D.E., DF1,3,5
Brouwer, W., CE2,3
Brown, I.D., CH8
Brown, T.S., EB1
Bryman, D., AD5
Buckmaster, H.A., AG9
Burgess, M.D.J., AC3,4
Burke, D.G., ED8
Buja-Bijunas, L., DE5
Burns, P., CHI2
Buyers, W.J.L., CA1; DF10; EF1
Caille, A., CGI
Cameron, I., CH12
Cameron, J.A., ED4
Campbell, J.L., CA3; DE3; GB3
Canaday, J.D., DF6
Carbotte, J.P. GA4
Carbotte, S., CH8
Cardman, L., EG7
Carette, J.-D., DF2,4; EC4
Carolan, J.F., GC8
Caron, L.G., CG2
Carter, A.L., AD5
Casano, L., EG6
Cassard, P., BD4
Champness, C.H., BG5,8; GC5
Chapman, G.H., GC4
Chang, J.-S., CB2,6; GB9
Chartier, D., BB5
Cheng, C.-W., ED2
Cheng, P.C., CH2
Chiu, J.C.H., DF8
Chodos, A., EE2
Church, P., AC9.11
Clarke, T.E., BA3
Claude, A., GB9
Clouter, M.J., EF9.11
Cochrane, R.W., CA10
Coleridge, P.T., CA4; EA3
Collins, M.F., CH9.10; GC1
Conzett, H.E., ED3
Copley, J.R.D., CHI; EF2
Corkum, P.B., BD1,4
Cortes, R., EF2
Cousins, T., DE4
Couture, P., BC5.6.7
Cowley, E.R., EF8
Craddock, M.K., CCI
Crawford, A.R., BH3
Crawford, J.E., AE7; EG3,4
Cronin, J.W., BEI
Cummings, P.T., CH6
Cunningham, A.J., CB2
Cunningham, I.A., CH11
Currie, J.F., AGI
Curzon, F.L., CF4
Dagg, I.R., GC6
Dahn, J.R., DF10
Dang, C. , BD2
D'Angelo, Y., AE1
Dasgupta, S.S., DD3
Datars, W.R., BB5; CA6,9; EA4
Davidson, W.F., AE5
Decoste, R., AC9.12
Del Bianco, W., EG6
Delisle, C., CF5
Denhoff, M. , BB8
Denner, W.W., EF11
De Pascale, M., EG6
Depommier, P.H., AD5; CC4
Desai, R.C., CG6
Dick, R., DE7
Dinser, R.J., CA6
Dimoff, K., CB3
Dixit, M.S., EG5
Dixon, A.E., GC6
Douglas, R.J., BB4
Drake, G.W.F., DB1
Drake, T.E., DD2; EG7
Dunn, J.L., BB7
Dutta, A.K., DD7
Easson, I., DD8
Egelstaff, P.A., CH5,6
El Azab, M., GC5
Elliott, M., CA9
Enns, D.I., DF5
Enright, G.D., AC3,4
Faggiani, R., CH8
Faiq, S., DE3
Fawcett, E., AG5,7
Feder, D., AG5
Federici, L., EG6
Fedosejevs, R., AC3
Findlay, W., CH2
Fischer, C.W., DF6
Fleming, D.G., AD4
Fletcher, R., CA7
Folinsbee, J.T. DF7
Forsyth, P.A. , CD5
Frank, J.P., BB1
Frindt, R.F., DF9
Froelich, H.R., GB2
Frullani, S., EG6
Fujii, Y., AB4
Fulford, J.A., CD5
Gaily, T.D., GB8
Gammon, P.H., EF11
Garland, C.W., AG4
Garner, D. , AD4
Garrett, J.D., CH8
Garside, B.K., BD2,5,6; GC4
Gauthier, N., BB6; CG7
Geldart, D.J.W., DA2
Geoffrion, J., BC6
Ghosh, A.K., BC10
Gibson, R.S., DE3
Giles, G.L., EG3,4
Gillespie, R.J., BB5
Giordano, G., EG6
Girard, A., CF5
Girolami, B., EG6
Glyde, H.R., CG10; EF4
Godard, R., CB6
Gold, A.V., CA5
Goodings, D.A., CG12
Gotow, K., AD5
Goudard, J.-L., GC9
Gough, T.E., AF8
Grant, M., CG6
Greedan, J.E., CH8.10; GC1,2
Gregory, B.C., BC5,6; EB2
Grek, B., AC10.11; BC6,8
Griffin, A., EF5
Grover, C.P., CF3
Guillon, F., BB2
Gulbranson, R. , EG7
Gygax, S., BB8
Haberl, J.P., BB4
Habib, E., ED4
Haering, R.R., DF8,10
Hammaren, E., ED8
Hardy, W.N., BB3
Hargrove, C.K., AD5
Harker, A.H., BG2
Harms, A.A., BF4.5
Harris, R., EA2
Harrison, J.P., BB2
Harvey, M., EE3
Hashimoto, K., CB5
Hasinoff, M., AD5
Hausser, 0., EG5
Hein, P.C. , AC5
Hemingway, R.J., CC2
Hewitt, J.S., BF3
Hilborn, J.W., BF9
Hincks, E.P., AD5
Hintenberger, F., ED3
Hirose, A., BC2,3,7; DC8
Hobson, R.M., CB2; GB9
Hodgson, R.J.W., DD6
Hoff, R.M., AF11
Hofstee, J., CD5
Holt, R.A., GB8
Horton, G.K., EF8
Hota, N.H., GC9
Hougen, J.T., AF3
Ichikawa, Y., CB5
Ilowski, J., DE8
Ingrosso, L., EG6
Irfan, M., AE6
Irwin, J.C., AB1
Isgur, N., AD1; BE4
Ishihara, 0., DC7
Islam, A., AE2
Islam, M.A., DE2
Jaanimagi, P.A., AC4
Jacobs, P.W.M., BG3
Jacques, P., GC7 •
Jandl, S., AB2; BG4
Janzen, V., ED4
Jeremie, H., EG6
Jericho, M.H., DF7
Jochemsen, R., BB3
Johns, M.W., AE3; ED5
Johnson, D.C., CF2
Johnston, J.A., DD5
Johnston, T.W., AC9,10,11,12;
BC6; DC3,4
Kahana, S., EE4
Kaiser, C.J., GB2
Kamitsuma, M., CB5
Kaplan, S.N., EG5
Karl, G., DB3
Karttunen, S., AC8
Kasting, G.B., AG4
Kavanagh, R.J., AA1
Keech, G.H., CG10
Keinonen, J., ED2
Keller, N.A., BF9
Kennett, T.J., DE2,4,6; EG8
Kessler, D., AD5
Key, M.H., AC2
Khan, T.A., AE3
Khanna, F.C., EF4
Kieffer, J.C., AC12
Kiefte, H., EF9.11
Kim, S.M., CA1
Kinsner, W., BA2
Kitching, J.E., EG3,4
Kleiman, J., AG3
Klein, M.L., EF12
Knowles, J.W., EG7
Koffyberg, F.P., BG7
Kohno, M., DD4,7
Koniuk, R., BE4
Kos, J.F., AF10
Kreitzman, S.R., EF3
Krenciglowa, E.M., BF4,5
Kubik, P., BB3
Kuehner, J.A., ED6
Kugler, G., BF7,8
Kumar, K.S., BE3
Kushneriuk, S.A., BF6
4
52
Kuwahara, H., BC2
Kydon, D.W., CH4
Labrie, D., BD3
Lachambre, J.L., AC6,1
Lahlou, F., DD3
Lai, S.K., CAll,12
Lakhani, A.A., GC9
Landesman A., BB3
Langdon, A.B., DC7
Larabee, A.J., EG2
Larimer, R.M., ED3
Law, J., DD5
Leblanc, B., CB4
Lee, A.G., ED7
Lee, J.K.P., BF1,2
Lee, F.A., GA2
Lefebvre, J., EF2
Lene&tour, K., AE2
Lepine, Y., BG4; CG3
Leung, Y., AF10
Lichtenberger, P.C., CA3
Lia, T.K., BD6
Lin, F.K., AF9
Liu, U.K., AF7
Locke, K.E., EF1
Longworth, G., CH9
LorInez, G., AG5
Love, W.G., DD2
Luke, T.M., GB5
Lupton, L.R., DE9
Lushington, K.J., AG4
Lyon, G.F., CD5
MacDonald, J.A., AD5; EG5
MacDougall, J.W., CD5,6
Mach, H.A., ED5
MacKenzie, I.K., CA2, DE8
MacLean, D.A., GC2
Mak, H.-B., EDI,2
Maki, K., EF12
Malhotra, V.M., AG9
Mar, H., AG3
Matjorlbanks, R.S., AC4
Marko, A.M., FA3
Marsolais, R., BB3
Martin, F., AC9.10.11,12
Martin, J.-P., AD5
Marton, J.P., BD6
Maaon, G.R., EG5
Matone, G., EG6
Matte, J.-P., BC6
Mattioli, M., EG6
May, A.D., DB4
McConkey, J.W., EC2
McCourt, F.R., AF7
McDiarmid, I.B., CD1
McEwan, D.J., CD2
McGowan, J.Wm., AF1; CH2; GB1.2
McKee, R . J . ,
AD5
McKee, T., BD4
McKellar, A.R.W., AF2
McKinnon, W.R., DF10
McLatchie, W., ED2
McMullen, T., CG5
Meade, D., BC1
Measday, D.F., AD4; BE5
Mes, H., AD5
Mlkula, R., AD4
Miller, R.E., AF8
Mindorff, M., DF3
Mltchel, G., AC10.11
Mitchell, J.B.A., AF1; GB2
Molzahn F., DD4
Montgomery, D.S., CG11
Moore, C.J., DF1
Moore, R.B., BF2
More, R., BA5
Morrison, J.A., CHI
Morrow, M., BB3
Morton, A.H., BC3,4
Muir, C., AG7
Mukherjee, B.K., BB7
Mul, P., AF1; GB2
Mustard, J.F., BH2
Neufeld, R., AC6.7
Ng, A., AC8
Ng, C., AE1; GB2
Nguyen, T.H., DC2
Nicholson, P.S., GC3
Nodwell, R.A., CF4
Nogaml, 1., BE3
Numao, T., AD5
Offenberger, A.A., AC8
Ogram, G.L., CB2; GB9
Oka, T., AF3
Okutsu, E., DC6
Olin, A., AD5; EG5
Orllkovskl, T., AF4
Ormrod, J., CC3
Page, J.H., AG2
Pasquarlello, G., EG6
Paul, W., GC7
Paulson, J.D., DC8
Pearce, R.M., AD5; EG5
Peemoeller, H., CH3.4
Pelfer, G., EG6
Pepin, H., AC1,9,10,11,12
Perz, J.M., CA8
Petrovich, F.L., DD2
Picard, G., DC3,4
Pich, B.O., EG7
Picozza, G., EG6
Pilt, A.A. ED4.6
Pink, D., GA1
Pintar, M.M., CH3,4,12
Plint, C.A., EF6.10
Pocobelli, G., DC1
Poldi, E., EG6
Poll, J.D., AF4
Pongratz, M.B., CD4
Poutissou, J.M., AD5; BE5
Poutissou, R., AD5
Powell, B.M., DF10
Prasad, R.D.G., AF6
Prestwich, W.V., CH11; DE2,4i
Prosperi, D., EG6
Racz, Z., CG8
Rajotte, R., BC7
Ramadan, B., AF10
Ramsey, N.F., DB2
Reddy, S.P., AF6
Rees, C.E., DE2
Reeve, P., AD5
Rehfield, D.M., BF2
Reid, J., BD2,3,5
Reines, F., AD2
Remple, T.B., BC3
Reyes, J.M., DF9
Richardson, M.C., AC3,4
Rioux, C., DD3; ED3
Roberts, G.D., GC6
Robertson, B., BE5
Robertson, J.A.L., FA2
Robertson, L.B., AD5
Robinson, A.M., AF5
Robinson, J.E., EB4
Rochon, P., BB6
Rogers, D.W.O., DE5
Rogers, P.D., BB7
Rolfe, J., BG1
Rosner, S.D., GB8
Ross, C.K., DE5
Ross, W.R., GB4
Rouben, B., BF7.8
Roy, R., DD3; ED3
Rueslnk, D.W., CA8
Russell, S.B., DE3
Saha, S.K.. ED2
Salansky, N., AG3
Salomon, M., BE5
Sawatzky, G.A., GC8
Sayer, M., GC3
Schaerf, C., EG6
Schloessin, H.H., CH7
Scholtz, G.A., DF9
Schott, L., DC6
Schreiner, L.J., CH3
Schubank, R., ED4
Schulte, C.W., CA3; GB3
Schultz, P.J., CA2; DE8
Scoles, G., AF8
Segel, S.L., GC3
Sen, A., AF1; GB2
Shahbuddin, M.A.M., ED6
Shenoy, R.K., CH3,4
Shepherd, J., AA3
Sheppard, D.M., CC5
Shih, I., BG5,8
Shkarofsky, I.P., BC9.10
Shyamprasad, N.G., BG8
Shoucri, M., BC9
Shukla, R.C., EF6
Simpson, J.J., AD3
Sinclair, G., BA1
Sivasankar, V.S., BG3
Skarsgard, H.M., BC2.3
Slobodrian, R.J., DD3, ED3
Smith, G., CD4
Smith, G.D., DE5
Sobie, R., DD2
Sodertolm, L., GC1
Sofia, K., AE7
Southern, B., GA3
Sprung, D.W.L., DD4
Spuller, J., AD5
Stager, C.V., EF1
Stansfield, B.L., CB4
Statt;, B., BB3
Stevens, E.D., AB3
Stott, M.J., GB6; CG9
Subba Rao, B.N., AZ7
Sullivan, J.D., CH5
Sullivan, H.M., CD7
Summers-Gill, R.G., AE2; ED7
Sutherland, P., EE1
Suzuki, T., AD4
Svensson, E.C., DA3
Tacik, R., EG3.4
Talman, J.D., GB5
Tam, S.Y.K., BC10
Tannous, C., CGI
Tarns, P., AE1
Taylor, D.R., AG2,8
Teichmann, J., DC5
Teii, S., CB5
Teitsma, A., GC3
Templeton, I.M., CA4
Teuchert, W.D., EF2
Till, S.M., DE7
Tinusk, T., AF9
Torrie, B.H., EF7
Towns end, M.G., CH9
Toyoda, T., CA4
Trtsnblay, R., CF3
Trischuk, J., BE2
Tse, W.S., EF7
Turner, C.W., CH10
Turyk, P., BF7
Tyler, A., BB2
Vail, J.M., BG2
Van Dijk, W., BE3
Van Driel, H.M., AC5
Van Schyndel, A.J., CA5
Varley, B.J., EG3.4
Vijh, A.K., CB3
Villeneuve, D.M., AC3,4
Vogt, E.W., AA4
Vcm Rossen, P., ED3
Waddington, J.C., EG1,2
Walker, M.B., AG6
Wang, S., CA11, 12
WatanabeY., BC2
Webber, C.E., DE4
Webster, D.C., BA4
Weichman, F.L., BG6
Weinberg, A.M., FA1
Weingartshofer, A., EC3
Vhalen, B.A., CD3,4
Whitehead, L.A., CF4
Whitmore, M.D., CG12
Wiederick, H.D., BB7
Williamson, C.F., DD2
Wilson, J.C., BF3
Wong, P.Y., BF6
Woods, D.R., CEI
Wright, S.C. AD5
Yau, A.W., CD4; GB9
Yen, S., DD2; EG7
Younis, M., BF8
Zarate, C.E., DE6
Zaremba, E., CG9; GB6
Zobin, D., GB6
Zochowskl, S., AG7
Znotlns, T.A., BD5
SERVICE D'AIDE À L'EMPLOI
de l'Association Canadienne des Physiciens
Pour faciliter les contacts entre les physiciens de niveaux M.Se. et Ph D. et les
employeurs éventuels, le bureau de l'ACP va garder à jour des listes de postes vacants
et de physiciens à la recherche d'emploi. Ces listes seront disponibles sur demande.
Si vous êtes à la recherche d'un emploi ou si vous avez une offre d'emploi pour un
physicien, téléphonez ou écrivez à:
SERVICE D'AIDE À L'EMPLOI
A S S O C I A T I O N C A N A D I E N N E DES P H Y S I C I E N S
1 5 1 , RUE SLATER, S U I T E 9 0 3
OTTAWA, ONTARIO
K1 P 5 H 3
(613)237-3392
Vous trouverez dans la section Renseignements Généraux de ce numéro la description
des services du Centre de l'Emploi au Congrès de l'ACP à Hamilton.
EMPLOYMENT CONTACT SERVICE
of the Canadian Association of Physicists
To establish contact between M.Sc. and Ph.D. graduates in physics and potential
employers, the CAP Office will maintain up to date lists of jobs available and physicists
seeking jobs. These lists will be sent to physicists and employers upon request.
If you are looking for a job or have a position available phone or write to:
E M P L O Y M E N T C O N T A C T SERVICE
C A N A D I A N A S S O C I A T I O N OF P H Y S I C I S T S
151 SLATER ST., S U I T E 9 0 3
OTTAWA, ONTARIO
K1 P 5 H 3
(613) 2 3 7 - 3 3 9 2
For details of the Job Centre at the CAP Congress in Hamilton, please see the General
Information section of this issue.
M c M A S T E R UNIVERSITY
NUCLEAR REACTOR SMALL
NEUTRON SCATTERING
RESEARCH POSITION
in
FAST BEAM
A T O M I C PHYSICS
ANGLE
FACILITY
A Small Angle Neutron Scattering Facility, to be constructed at the McMaster Nuclear Reactor, has recently been funded by the Natural Sciences and Engineering Research Council of Canada and by McMaster
University. The instrument will be used for a wide
range of structural studies in such fields as
biochemistry, polymer science, and materials science,
the emphasis being on measurements of sizes and distances in the approximate range 30-600A. Applications are invited for a Research Assistant or Research
Associate who will be concerned with all aspects
of design, construction and testing of the facility.
Preference will be given to candidates with some experience in the design of experimental equipment. The
candidate should have at least a Bachelor's degree,
but those with higher qualifications such as an M.Sc.
or Ph.D. are also encouraged to apply. The position is
initially for a two-year period.
Interested persons are asked to send curriculum vitae,
including publication list, and names of a least two
referees, to:
Mrs. S. Lucken
Employment Interviewer
McMaster University
Hamilton, Ontario
L8S 4L8
Applications are invited for a postdoctoral, research
associate or sabbatical leave position, to work on experiments in fast-beam atomic physics. Current activities include spectroscopic analysis and radiative
lifetime measurements using the beam-foil technique,
and polarization measurements following beam-tiltedfoil excitation. Future experiments using laser excitation are being planned Facilities are also available for
"forbidden'' line transition rate measurements and
Zeeman effect spectroscopy. Stipend is negotiable,
but minimum will be $1 1 75/month.
Please send applications with curriculum vitae, list of
current research interests and the names of three
references to
Dr. J. A. Kernahan
Department of Physics
University of Alberta
Edmonton, Alberta
T6G 2J1
as soon as possible.
LABORATOIRE DE P H Y S I Q U E
NUCLÉAIRE
UNIVERSITÉ DE M O N T R É A L
POST DOCTORAL
POSITION
IN EXPERIMENTAL
SOLID STATE PHYSICS
POSTES D ' A T T A C H É S DE
RECHERCHE
Le Laboratoire de Physique Nucléaire de l'Université de M o n t r é a l sollicite des c a n d i d a t u r e s à
plusieurs postes d ' a t t a c h é s de recherche. Les
c o n d i t i o n s à remplir sont un d o c t o r a t (Ph.D.) en
p h y s i q u e nucléaire ou dans un d o m a i n e connexe,
et q u e l q u e s années d'expérience pertinente. En
plus de collaborer au p r o g r a m m e de recherche
f o n d a m e n t a l e ou appliquée du laboratoire, les attachés de recherche p a r t i c i p e r o n t à une é t u d e en
cours sur les accélérateurs de particules. La
r é m u n é r a t i o n sera établie suivant l'échelle des
professeurs adjoints.
Veuillez s o u m e t t r e vos c a n d i d a t u r e s au:
Professeur Pierre D e p o m m i e r
Directeur
Laboratoire de Physique Nucléaire
Université de M o n t r é a l
C a s e Postale 6 1 2 8
Montréal
H 3 C 3 J 7 , Qué.
Téléphone: ( 5 1 4 ) 3 4 3 - 6 7 2 2
Télec: L P N U M M T L 0 5 5 . 6 1 3 5 9
To w o r k on various problems connected w i t h
magnetic semiconductors.
Annual stipend will depend on qualifications,
m i n i m u m is t h e o f f i c i a l N S E R C p o s t d o c t o r a l
rate of $ 1 2 , 9 0 0 .
Send curriculum vitae and n a m e s of referees
to:
P r o f e s s o r F. T. H e d g c o c k
Physics D e p a r t m e n t
M G i l l University
3 6 0 0 University Street
Montréal, Québec
H3A
2T8
DIRECTOR
D I V I S I O N OF M E D I C A L P H Y S I C S
COMPREHENSIVE
CANCER CENTRE
Applications are invited for the post of Director of the
Division of Medical Physics. This division provides services in radiotherapy physics, diagnostic radiology,
nuclear medicine, and radiation protection The Division has six full time physicists involved in service and
research, as well as technical sections of electronics,
treatment planning, and machine shop with a total
staff of 30 housed in approximately 14,000 feet of
space including large modern research laboratories.
The Division is part of a comprehensive cancer treatment and research centre which includes radiation oncology, medical and surgical oncology, epidemiology
and biological and clinical research. The Centre is
located within the Campus of the University of
Manitoba Medical School and the Primary Teaching
Hospitals. Academic appointment, rank, and salary appropriate to appointee.
Application including curriculum vitae should
forwarded to:
Dr. L. G. Israels
Executive Director
Manitoba Cancer Treatment
and Research Foundation
7 0 0 Bannatyne Avenue
Winnipeg, Manitoba
R3E 0 V 9
Canada
(204 — 7 8 7 - 2 2 4 1 )
be
X-RAY
PROGRAM MANAGER
EDMONTON
If you have an in-depth knowledge of health physics
and well-developed management skills this opportunity may be of interest. Your technical innovation
and leadership abilities are needed to provide direction
to a small team of Radiation Health Officers servicing
medical, dental, and paramedical x-ray facilities.
Qualifications: Must have Health Physics degree and
some related experience or CAMRT and current extensive related experience Interview expenses paid
Further details available from John Wetherill, Branch
Director at 4 0 3 - 4 2 7 - 2 6 9 1
Salary Up to $28,872 (depending on qualifications)
Generous relocation assistance provided
Competition #441 -3
Closing Date: June 15. 1980
For detailed information, request Job Bulletins and apply to.
Alberta Government Employment Office
5th Floor, Melton Building
1 0 3 1 0 Jasper Avenue
Edmonton, Alberta
T5J 2 W 4
POSITION OPPORTUNITY
POSITION OPPORTUNITY
RESEARCH SCIENTIST IN
PARTICLE PHYSICS
RESEARCH ASSOCIATES IN
PARTICLE PHYSICS
The INSTITUTE OF PARTICLE PHYSICS OF
C A N A D A invites applications for Research
Scientist positions. Applicants should have
proven
ability
in E x p e r i m e n t a l
Particle
Physics Initial a p p o i n t m e n t s w i l l be for t h r e e
years followed
by a review
which,
if
favorable, w i l l lead t o a c o n t i n u i n g career app o i n t m e n t . Initially Research Scientists will
b e e x p e c t e d t o j o i n o n e o f t h e e x i s t i n g I.P.P.
c o l l a b o r a t i o n s at F e r m i l a b or S L A C b u t t h e
opportunity to initiate n e w experiments will
also exist. A p p l i c a t i o n s i n c l u d i n g c u r r i c u l u m
vitae, transcripts and the n a m e s of 3 referees
s h o u l d be sent t o :
The I N S T I T U T E OF P A R T I C L E P H Y S I C S OF
C A N A D A invites a p p l i c a t i o n s for Research
A s s o c i a t e P o s i t i o n s . O p e n i n g s e x i s t in t h e
Canadian
experimental
particle
physics
g r o u p s l o c a t e d at C a r l e t o n , M c G i l l , O t t a w a ,
Toronto and York Universities. These groups
a r e c o l l a b o r a t i n g in e x p e r i m e n t s at F e r m i l a b
and SLAC. Applications including curriculum
vitae, transcripts and the n a m e s of 3 referees
s h o u l d be sent t o :
J. D. Prentice
D e p a r t m e n t of P h y s i c s
U n i v e r s i t y of T o r o n t o
Toronto, Ontario
M 5 S 1A7, Canada
J. D. P r e n t i c e
D e p a r t m e n t of P h y s i c s
U n i v e r s i t y of T o r o n t o
Toronto, Ontario
M 5 S 1A7, Canada
St. Francis Xavier
University
UNIVERSITE LAVAL
ASSOCIÉS DE RECHERCHE
ET
Antigonish, Nova Scotia
STAGIAIRES
POSTDOCTORAUX
Le laboratoire de l'accélérateur Van de Graaff de
l'Université Laval offrira, à compter de juin 1980, des
postes d'associés de recherche et des stages de
recherche postdoctorale. Les candidats acceptés
seront attachés à une équipe de recherche en physique nucléaire expérimentale
L'engagement des stagiaires sera pour une période
d'une année avec
possibilité d'un renouvellement
pour une deuxième année. Pour les postulants d'expression anglaise la connaissance de la langue
française parlée et écrite est souhaitable bien que non
nécessaire.
Le laboratoire dispose d'un accélérateur électrostatique de 7 MV qui produit des faisceaux allant de H + à
Ar3"1". Une source d'ions d' 3 He + polarisés est en projet.
Les recherches portent sur la spectroscopic et les
réactions nucléaires, les systèmes à petit nombre de
corps et les phénomènes de polarisation
Adresser son curriculum vitae et les noms de deux
répondants avant le 31 mai 1 9 8 0 au:
POST D O C T O R A L
FELLOW/RESEARCH ASSOCIATE
The Atomic and Molecular Physics group at St.
Francis Xavier University, Antigonish, Nova Scotia is
looking for a post doctoral fellow/research associate in
Atomic Physics. The position is initially for one year
and can be extended further. The salary will be in accordance w i t h the N.R.C. regulations.
The candidates should have experience in the
vacuum-ultra violet spectroscopy — in emission or
absorption. The present research interests are highly
ionized spectra of autionized series.
Position available from June 1. 1 9 8 0 or earlier Write
to:
Dr. Y. N. Joshi
Professor A. Weingartshofer
Physics Department
St. Francis Xavier University
A N T I G O N I S H , Nova Scotia
B2G 1 C 0
Professeur R. J. Slobodrian
Département de physique
Université Laval
Cité universitaire
Québec, Canada
G1K 7P4
University
of Victoria
TRIUMF
University of Victoria
PO BOX 1700 VICTORIA
y BRITISH COLUMBIA CANADA /
\
V8W 2Y2
/
Research Positions in
Experimental Intermediate Energy Physics
Applications are invited for three positions available for
research in Experimental Physics at TRIUMF. The successful
applicants will be engaged in the University of Victoria
research programs, which presently include studies of pionic
and muonic X rays, of rare decay modes of the pion and
muon using the TPC facility, and of the nucleon-nucleon interaction
1. T R I U M F Research Scientist — This appointment at
the TRIUMF facility will be initially for a period of two
years and is renewable with the opportunity for appointment without definite term As well as research, the
position will entail duties associated with the TRIUMF
Experimental Facilities Group. Salary is negotiable
depending on experience. Closing date for applications
is June 30th.
2. IEP Fellow — This position is funded by the National
Science and Engineering Research Council. Initial appointment will be for a term of up to three years. Anticipated salary will be in the range of $ 2 0 , 0 0 0 to
$ 2 4 , 0 0 0 Closing date for applications is June 30th.
3. Research Associate — Appointment will be made initially for one year and is renewable. Salary will depend
on experience, with a minimum of $1 7,000 per annum
Applicants should send a curriculum
vitae and the
names of three references to:
Dr. L. P. Robertson
Department of Physics
University of Victoria
Victoria, B.C. V 8 W 2Y2
McMASTER UNIVERSITY
POST D O C T O R A L F E L L O W S H I P S
RESEARCH A S S O C I A T E S H I P S
AND
GRADUATE ASSISTANTSHIPS
Applications are invited for post doctoral fellowships,
research associateships and graduate assistantships in
the Physics Department Areas of research include
theoretical physics, solid state physics, nuclear
physics, quantum optics mass spectrometry, chemical
physics and astrophysics. Experimental research
at McMaster features a tandem accelerator, a
swimming-pool reactor and the Institute for Materials
Research.
A p p l i c a t i o n s for post d o c t o r a l f e l l o w s h i p s and
research Associateships should include curriculum
vitae and the names of three referees
Applicants for graduate assistantships should write for
further information
Write:
Dr. M . F. Collins
Chairman, Department of Physics
M c M a s t e r University
Hamilton, Ontario
L8S 4 M 1
Write for your examination copies of these
mo
International Journal of
Thermophysics
Journal of Thermophysical Properties,
Thermal Physics, and Its Applications
editor: Ared Cezairliyan, N a t i o n a l Bureau of
Standards
PLENUM
JOURNALS
T h e International Journal of Thermophysics is a m a j o r
focal point for c o m m u n i c a t i o n w i t h i n the scientific and
technical communities, serving both the g e n e r a t o r s and
users of t h e r m o p h y s i c a l properties data. Its interdisciplinary a p p r o a c h reflects the o v e r l a p p i n g interests of
those w o r k i n g in various fields of science a n d engineering related to t h e r m o p h y s i c a l properties and thermophysics and its applications.
Subscription: Volume 1, 1980
(4 issues)
$58.00 ($66.00 outside US)
Journal of Fusion Energy
Journal of Nondestructive
Evaluation
editor: L a w r e n c e M. Lidsky, P l a s m a F u s i o n Center,
M a s s a c h u s e t t s Institute of T e c h n o l o g y
editor: M i c h a e l J. Buckley, D e f e n s e A d v a n c e Research
Projects Agency, Arlington, Virginia
If t h e r m o n u c l e a r f u s i o n is to evolve as a viable source
of energy, the s i m u l t a n e o u s solution of p r o b l e m s of
physics, technology, and e c o n o m i c s must be sought. To
this end, the Journal of Fusion Energy f e a t u r e s the
rapid publication of research results pertinent to the
d e v e l o p m e n t of t h e r m o n u c l e a r f u s i o n as a u s e f u l
p o w e r source, as well as articles covering m a t t e r s of
policy and p r o g r a m direction.
Subscription: Volume 1, 1980 (4 issues)
Institutional rate
$60.00 ($68.00 outside US)
Personal rate
$30.00 ($35.00 outside US)
T h e Journal of Nondestructive Evaluation is a n e w interdisciplinary journal c o n c e r n e d with the area of nondestructive evaluation of structural c o m p o n e n t s . T h e
Journai e m p h a s i z e s a d v a n c e s in the d e v e l o p m e n t of
quantitative m e a s u r e m e n t capabilities, suitable materials failure models, and accept/reject criteria. Particular
e m p h a s i s is placed on the interaction b e t w e e n these
various c o m p o n e n t s of NDE in developing a holistic
a p p r o a c h to solving generic problems, and on the coupling b e t w e e n science and engineering in developing
new NDE instrumentation.
Subscription: Volume 1, 1980
(4 issues)
$60.00 ($68.00 outside US)
The International Journal of
Infrared and Millimeter Waves
editor: Kenneth ]. Button, M a s s a c h u s e t t s Institute of
Technology
The International JournaJ of Infrared and Millimeter
Waves provides a f o c u s e d dissemination of a d v a n c e s in
this area, covering f u n d a m e n t a l research, c o m p o n e n t
d e v e l o p m e n t , a n d system application. Proceedings of
the A n n u a l International C o n f e r e n c e on I n f r a r e d and
Millimeter W a v e s are published in the Journal.
Subscription: Volume 1, 1980
(4 issues)
$58.00 ($66.00 outside US)
Plenum
• k
Journal of Soviet Laser Research
Published under the auspices of the P. N. Lebedev
Institute of the A c a d e m y of Sciences of the USSR
This outstanding n e w quarterly journal f e a t u r e s research selected for its timeliness a n d i m p o r t a n c e to this
rapidly growing field. Coverage includes current research in areas such as laser chemistry; laser applications; laser physics; laser p u m p i n g ; a n d solid-state, gas,
liquid, chemical, a n d s e m i c o n d u c t o r lasers.
Subscription: Volume 1, 1980
(4 issues)
$95.00 ($110.00 outside US)
H THE LANGUAGE OF SCIENCE
PUBLISHING CORPORATION
227 West 17th Street, New York, N.Y. 10011
In United Kingdom: Black Arrow House
2 Chandos Road, London NW10 6NR, England
f
s
/
V
University of Alberta
University of Guelph
Department of Physics
POSTDOCTORAL FELLOWSHIPS
AND
RESEARCH A S S O C I A T E S H I P S
IN P H Y S I C S
GRADUATE STUDIES AND
POST-DOCTORAL FELLOWSHIPS
Applications-are invited for postdoctoral fellowships
and research associate^hips in the Physics Department Research areas include Biophysics, Physics of
Solids, Particle Solid Interactions. Molecular Physics.
Statistical Mechanics of Fluids. Atomic and SubAtomic Physics.
A recent report orr the research activities of the
Physics Department may be obtained from the address below.
Stipends for Fellowships range upward from the
NSERC minimum of $ 9 7 5 per month. Salaries for
Associateships are negotiable.
Applications, including curriculum vitae
names of three referees should be sent to:
and
the
Dr. J. R. MacDonald, Chairman
Physics Department
University of Guelph
Guelph, Ontario
N1G 2 W 1
For further information, please write to
Associate Chairman, Department of Physics
University of Alberta, Edmonton, Canada
T6G 2J1
(403)432-3518
RESEARCH ASSOCIATE
A
term
mediately
position
in
the
is
available
Department
imof
Chemical Engineering in the area of
c o m p u t e r modelling of mass dispersion
and
sedimentation
in
ocean
waters. Applicant must have a doctorate, preferably in Physics. Salary
minimum,
$17,000/year
The Department of Physics currently has 50 faculty
members, complemented by approximately 50
graduate students and 25 Post-Doctoral Fellows and
Research Associates.
Applications are invited for admission to programs
leading to the degree of M.Sc. or Ph D Excellent
facilities exist for research in OBSERVATIONAL
ASTRONOMY, ATOMIC PHYSICS. BIOMEDICAL arid
RADIOLOGICAL PHYSICS, GEOPHYSICS, LOW
TEMPERATURE and SOLID STATE PHYSICS, MASS
SPECTROMETRY, NUCLEAR PHYSICS, SPACE
PHYSICS and THEORETICAL PHYSICS
Post-Doctoral positions are also available in many of
the above areas of research
Graduate assistantships are available with stipends
ranging up to $8,800 per annum Scholarship and
Fellowship holders are eligible for total stipends of up
to $1 1,000
Post-Doctoral Fellowship awards are currently valued
at $ 1 2 , 9 0 0 (under review) with opportunities existing
to teach an undergraduate course for additional stipend.
commen-
surate w i t h experience and qualifications.
Send résumé w i t h references to:
Dr. A. F. M c M i l l a n
D e p a r t m e n t of Chemical Engineering
Nova Scotia Technical College
P.O. Box 1 0 0 0
Halifax, Nova Scotia
B3J 2 X 4
RESEARCH SCIENTIST
A research scientist position is available at
T R I U M F in the area of intermediate energy
proton induced reactions. A n experimentalist,
having a number of years of postdoctoral experience, is sought to take a major responsibility for the program of the University of
Alberta group. Some additional duties in the
area of facility development may be anticipated. The successful candidate will be
eligible for project tenure after a probationary
period, and additional benefits similar to
those for University Faculty appointments are
applicable. Salary w i l l be commensurate w i t h
experience but should be in the range of
2 0 , 0 0 0 to 3 0 , 0 0 0 $C.
Please send a résumé and three letters of
reference to:
Research Scientist Search C o m m i t t e e
Nuclear Research Centre
University of Alberta
Edmonton, Alberta
T6G 2 N 5
to arrive not later than September 1 5, 1 9 8 0 .
High Technology
in a Low Cost MCA!
If you need a multichannel
analyzer but the performance
you require dictates a higher
price than your budget allows,
then consider Tracor Northern's
new TN-1750.
Compared with other
multichannel analyzers, the
TN-1750 offers more features,
exceptional performance at a
lower price and the quality you
expect from Tracor Northern.
Standard features include:
Scratch Pad Memory
A scratch pad memory
allows implementation of data
processor functions on a trial
basis. The results can be examined and printed without modifying the original spectrum.
Multiple Regions of Interest with
Regional Ratio
The TN-1750 provides gross
and net integral calculations for
up to 50 ROIs. An added feature
is the ability to compute a ratio
between integrals of two ROIs in
the same memory group or common ROIs in different memory
groups.
200 MHz Wilkinson Type ADC
for PHA
• Upper and Lower level
discrimination
SCA output
Coincidence/Anticoincidence input
Digital Zero Offset
• Active/Passive baseline
restoration
• Charge sensitive
Preamplifier/
Amplifier
Multichannel Scaling (MCS)
• Pulse counting to
10 MHz
• Dwell/channel from
10fi to 99 seconds
• External trigger
Data Processing Capabilities
• Normalization
• Fractional Spectrum
Stripping
• 5 point smoothing
-' Add/Subtract by a
constant
Display Capabilities
The flicker-free 6.5 inch
diagonal CRT features linear or
logarithmic vertical scaling with
manual or automatic vertical
scale selection, digital horizonta.
expansion and roll, 2 point
energy calibration and spectrum
overlap.
Data Input/Output
The serial ASCII input/
output port features internally
selectable data transfer rates
and is current loop or RS-232C
compatible.
Selectable data output
modes include ROI channels,
integrals, ratios or a full
spectrum with 32 character data
label.
Options
Options include floppy disk
storage, remote control, X-Y
recorder, multiplexer/routers,
stabilizers and much more!
jMAllan Crawford Associates Ltd.
•
T o r o n t o 416/678-1500. Montreal 514/731-8564 Vancouver 604/294-1326
Ottawa 613/829-9651. Calaarv 403/230-1341 Halifax 1-800-267-6131
50-100 times better
performance can make
a major difference
in your work.
An NRC table costs no more, so
why should you settle for less?
If you d o n ' t want your experiment dist u r b e d by vibration from t h e floor, by
ambient noise from t h e e n v i r o n m e n t , or
by your o w n e q u i p m e n t o n t h e table,
t h e n you must have a table top with high
static rigidity, low mechanical Q , plus an
effective isolation system. N R C has m a d e
significant advances in each of these areas
a n d we t h i n k you should k n o w .
Modal map of a dominant resonance.
Compliance curves show how table
top responds to acoustic excitations.
Static Rigidity
O u r table tops are m a n y times more rigid
t h a n o t h e r h o n e y c o m b tables a n d castiron surface plates. Superior dimensional
stability is achieved with proper choice of
material a n d m a n u f a c t u r i n g techniques.
O u r small-cell steel h o n e y c o m b core is
designed specifically for optical table
applications.
1
APPLIED IMPULSE
r
Isolation
O u r p a t e n t e d isolation system is effective
against small- a n d large-amplitude vibra-
0 3 SEC
CHANNEL NO. 1
tions in b o t h t h e vertical and horizontal
TABLE TOP RESPONSE
directions. N o t e t h e low resonant frequencies a n d t h e low peaks.
r
L
i
CHANNEL NO 2
FREQUENCY (HERTZ)
Energy applied to table top is quickly
absorbed
Other Factors
FREQUENCY (Hi)
Amplitude transmissibility of floor
vibration
Dynamic Rigidity
O u r table tops are 50-100 times m o r e
i m m u n e to acoustic excitations t h a n an
o r d i n a r y h o n e y c o m b optical table. M a n y
experiments that would have been impossible to c o n d u c t in t h e past are now d o n e
routinely o n o u r tables.
T h e r e ' s t h e convenient mounting-hole
array (on I " centers), the table top flatness, t h e way we build our products, a n d ,
ultimately, o u r m a n y , many satisfied customers. These are all i m p o r t a n t considerations. You can rely o n N R C .
. . . & Costs N o More
O u r top-of-the-line Research Series table is
t h e most popular. But our intermediate
KS system, w h e n ordered with 2 "-spaced
m o u n t i n g holes, actually costs less t h a n
similar systems m a d e by others, even
t h o u g h it has far superior static a n d
dynamic rigidity.
Useful Catalog
32 pages of bur 100 page catalog are
devoted t o a candid discussion of t h e
parameters t o consider in making your
table selection It's an in-depth treatment
backed u p by extensive test data. A n d it
includes the kind of background information you will find useful in planning your
experiments.
(mtc) Newport Research
*
A11791TT
A Dole Company
18235 Mt. Baldy Circle, Fountain Valley, Ca. 92708, Phone (714) 963 9811; Telex 685535