PROMETEO 2011
Valencia, 17-18 November, 2011

Design and build high efficiency detector consisting of 2 shells (or 1 phoswich shell) for medium resolution spectroscopy and calorimetry of g -rays in large energy range
Inner sphere, highly granular , made of new crystals ( LaBr3(Ce)) , to be used as a multiplicity filter of high resolution , sum-energy detector (calorimeter), detector for the gamma-transition up 10 MeV with medium energy resolution . It may serve also for fast timing application.
Outer sphere, with high volume detectors , made of conventional crystals (BaF2 or NaI), to be used for high-energy photons measurement or as an active shield for the inner shell..
2-shell or phoswich concept, in addition to being more economic, shall help to distinguish a high-energy photon from a cascade of low energy gamma transitions in fusion evaporation reactions

PARIS physics cases for SPIRAL2 h) Multiple Coulex of SD bands
36<A<50
* - flagship (P. Napiorkowski, F, Azaiez, A. Maj et al.) a) Jacobi and Poincare shape transitions (+AGATA)
*
130-142 Ba, 116-120 Cd, 88-98 Mo, 71 Zn
(A. Maj, J. Dudek, K. Mazurek et al.) i) Relativistic Coulex
(after postacceleration)
40<A<90
(P. Bednarczyk et al.) j) Nuclear astrophysics (p, g ) b) Studies of shape phase diagrams of hot nuclei –
GDR differential methods
186-193 Os, 190-197 Pt
(I. Mazumdar, A. Maj et al.) e.g. 90 Zr
(S. Harissopulos al.) k) Shell structure at intermediate energies (SISSI/LISE) c) Hot GDR studies in neutron rich nuclei *
(D.R. Chakrabarty, M. Kmiecik et al.) d) Isospin mixing at finite temperature
68 Se, 80 Zr, 84 Mo, 96 Cd, 112 Ba
(M. Kicińska-Habior et al.) e) Onset of the multifragmentation and the GDR
(+FAZIA)
120<A<140, 180<A<200
(J.P. Wieleczko, D. Santonocito et al.) f) Reaction dynamics by means of g -ray measurements
214-222 Ra, 118-226 Th, 229-234 U
(Ch. Schmitt, O. Dorvaux et al.) g) Heavy ion radiative capture *
24 Mg, 28 Si
(S. Courtin, D.G. Jenkins et al.)
20<A<40
(Z. Dombradi et al.) l) Shell structure at low energies
(separator part of S 3 ) *
30<A<150
(F. Azaiez, I. Stefan, B. Fornal et al.) m) PDR studied with GASPARD+PARIS
D. Beaumel et al.
n) PDR in proton-rich nuclei with
NEDA+PARIS
G. De Angelis et al.
o) Onset of chaotic regime:
PARIS+AGATA
S. Leoni et al.
p) Evolution of nuclear structure of 78 Ni and 132 Sn with ACTAR+PARIS
G.F. Grinyer et al.

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be transportable (between different facilities) be modular (to be connected with other detectors:
AGATA, GASPARD, NEDA, FAZIA, ACTAR ...) have high granulation (multiplicity measurement,
Doppler correction,...) have very high efficiency for high-energy g -rays have good timing resolution (<500 ps) have energy resolution as good as possible have some position sensitivity

‘cubic’-like
‘Ideal’ - spherical
‘radial’-like
CONCLUSION:
PARIS made of clusters:
Cluster = 9 phoswiches
This allows cubic or semispherical geometry

Basic element: a phoswich LaBr3+NaI
LaBr3
2”x2”x2”
NaI
(2”x2”x6”) PMT
5 prototypes were ordered from Saint Gobain:
1 to Orsay, 1 to Strasbourg, 3 to Krakow
They started to arrive 2 months ago only LaBr3 only NaI
LaBr3 + NaI

LaBr3
2”x2”x2”
NaI
(2”x2”x6”) PMT
Source
662 keV ( 137 Cs)
1173 keV ( 60 Co)
1332 keV ( 60 Co)
Q(120 ns)

Phoswich tests results

End 2011
Constructing one cluster
Present
First half of 2012

Simulations for one cluster made of 9 phoswiches
Full addback:
LaBr3+ LaBr3_NaI+NaI
Partial addback:
LaBr3+ LaBr3_NaI

Event generator for PARIS based on MC Cascade
Angular momentum g -Fold<6 g -Fold>30

Meeting in Orsaym 15.09.2011: Decision to go for MoU for PARIS Phase2
(2012-2015), to be signed in January 2012 (France, Poland, India, Italy,….)

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 LaBr3+NaI phoswich is a viable solution for the elements of the eventual PARIS calorimeter, in terms of it meeting the requirements for energy and timing resolution
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The next step is to explore the performance of a cluster of 9 phoswich detectors - this phase has already begun with 5 (4) detectors delivered and a further 4 on order
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In-beam testing of this cluster will proceed soon
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The next phase will be a demonstrator of 4 clusters each of 9 phoswich detectors.
 At our meeting in September 2011, we have established the framework for the next stage through discussion of the form of an
MoU, which we hope to have received sufficient signatures by
January 2012.

PARIS Management board
A. Maj - project spokesman;
D.G. Jenkins, J.P. Wieleczko, J.A. Scarpaci - deputies
PARIS Advisory Committee
F. Azaiez (F) -chairman, D. Balabanski (BG), W. Catford (UK), D. Chakrabarty (India),
Z. Dombradi (H), S. Courtin (F), J. Gerl (D), D. Jenkins (UK) - deputy chairman,
S. Leoni (I), A. Maj (PL), I. Matea (F), Ch. Schmidt (F)
Active working groups
1. Simulations (O. Stezowski et al.)
2. PARIS mechanical design scenarios (S. Courtin, D. Jenkins et al.)
3. Physics cases and theory background (Ch. Schmitt et al.)
4. Detectors (O. Dorvaux et al.)
5. Electronics (P. Bednarczyk et al.)
6. PARIS-GASPARD synergy (J.A. Scarpaci et al.)
J. Pouthas – PARIS liaison to SPIRAL2 project management

F. Azaiez, D. Balabanski, P. Bednarczyk, J. Bettane, C. Bonnin, S. Brambilla,
M. Ciemała, D.R. Chakrabarty, S. Courtin, A. Czermak, O. Dorvaux, M. Dudeło,
C. Finck, A.K. Gourishetti, G. Hull, M. Jastrząb, D. Jenkins, M. Kmiecik, S. Kumar,
D. Lebhertz, I. Matea, I. Mazumdar, K. Mazurek, P. Medina, C. Mehdi, V. Nanal,
P. Napiórkowski, J. Peyre, J. Pouthas, M. Rousseau, O. Roberts, Ch. Schmitt,
O. Stezowski, J.P. Wieleczko, T. Zerguerras and M. Ziębliński

Piotr Bednarczyk

Serve 200-1000 detector channels ( energy and time per channel)
Perform pulse shape analysis for disentanglement of overlapping signals from a phoswitch components
Deal with fast signals of LaBr
3
: risetime <1ns, decaytime ~20 ns
Provide gamma time and energy relative to an external signal
Stand rates up to 100 kHz per channel
Keep time resolution better than 1 ns , for TOF purposes
Measure energies 1-50 MeV with 3% resolution.
Trigger less readout with timestamping
Be compatible with GTS based DAQ

LaBr3
PMT
E1
CsI or BaF2
(2”x6”)
PMT
(2”x2”)
E2 t1 t2
LaBr3
(2”x2”)
E1
CsI or BaF2
(2”x6”)
PMT
E2 t1 t2
E1,E2
LaBr3
(2”x2”)
CsI(NaI)
(2”x6”)
PMT
T1,T2

O.Dorvaux, D.Lebhertz,
C.Finck, et al
CAEN V1751 1 or 2 GHz digitizer
TNT2 x4 (2.5 ns sampling)
NaI
LaBr
3

IPHC ( M.Rousseau
)
100 MHz
0.7
400-1000 MHz
1.1
1.3

Short gate
LaBr3 DE/E: 3.2% (1.7 MeV)
100 MHz sampling should be sufficient
Algorithm must be better tested
Long gate
NaI DE/E: 5.1% (1.7 MeV)

A hybrid consisted of analog (CFD) and digital electronics for time and energy determination respectively
PSA (Jordanov ?)
-in VIRTEX6 or mezzanine (power consumption issue)
Milano solution for timing : signal pre-shaping (analog cirquit)