Bericht zu ISOLDE
Low-energy precision experiments:
– Laser Spectroscopy – COLLAPS
– Mass Spectrometry – ISOLTRAP
– Weak Interaction Studies – WITCH
Post-accelerated beam experiments:
 MINIBALL @ REX-ISOLDE
 HIE-ISOLDE
 TSR@ISOLDE
Peter Reiter
Universität zu Köln
KHuK Jahrestagung 2011
Physikzentrum Bad Honnef
8. - 9. Dezember 2011
Folie: 1
ISOLDE – Some statistics
ISOLDE-Collaboration: 13 member states + CERN
BMBF-Funding (~10% contribution to the ISOLDE collaboration):
German contribution to ISOLDE:
40 t€ / year
to HIE-ISOLDE:
40 t€ / year
>60 publications / year (among them ~10 Phys. Rev. Lett.)
>20 PhD students / year
Year
2009
2010
2011
Shifts requested
~480
~500
~650
Shifts scheduled
~400
~400
~440
1 shift = 8h of protons on the target
18 experiments out of 50 scheduled in 2011 have
spokesperson presently at a German institute.
Shifts delivered
350
340
360
> 80%
high reliability!
The (HIE-)ISOLDE
ISOLDE facility
New target laboratory (class A lab)
New targets
ISCOOL (Mainz, MPIK)
RILIS Upgrade (Mainz)
University Bonn
University Darmstadt
University Köln
LMU Munich
TU Munich
WITCH
University Münster
Hall extension
GSI Darmstadt
MPIK Heidelberg
University Mainz
University Münster
University Tübingen
GSI Darmstadt
MPIK Heidelberg
University Dresden
University Greifswald
Upgrade ISOLDE/RILIS Lasersystems
(K. Wendt, Mz)
Bisheriges Farbstoff
Lasersystem
ISOLDE
Neues Titan:Saphir
Lasersystem
Farbstoff-Laser
Titan-Saphir-Laser
ISOLDE/RILIS Kabine - Panoramaansicht
Beam developments (K. Wendt, Mz)
Laser Ion Source Trap (LIST)
New astatine RILIS beams
Status of the LIST project
• successful implementation to
ISOLDE target / ion source unit
• promising tests at ISOLDE off-line
and UMz separator
• on-line driver electronics in construction
• first on-line run scheduled 2009
highly selective laser ion source:
Beam emittance ~ 3  mmmrad
- fully
commissioned
Pulsed time structure <7.5 s
10
LIST
W cavity
- at HRS front-end production of 21Na, 27Mg
LIST Features:
- highest selectivity (gain 200-1600)
RMS = 3.3 Pi mm mrad
5
y'/ mrad
0
- acceptable efficiency
-5
- preparation of purest
-10
-15
-8
-4
0
4
• highest selectivity
(loss
50) emittance
• small
bunched beam release
ion •beams!
for RIB production
at ISOLDE
8
FWHM = 7.5 s
0
25
50
75
100
125
Beam developments are of utmost importance for the success of ISOLDE.
y/ mm
F. Schwellnus, K. Wendt et. al. , NIM B 266(2008) 4383–4386
Flugzeit / s
COLLAPS: Collinear laser spectroscopy
electrostatic
deflection
ion beam
Ekin<60 keV
charge exchange cell (Na)
Optical
detection
electrostatic lenses
Beam
for retardation
deflector
+
 Laser
laser beam
fixed frequency
+
+
+
+
+
+
+
+
N reg.
excitation & observation
(weak) Guiding field
+
+
+
+
+
+
RF
Cry
Scin
o
s
(strong) NMR field
o
25 25
HFS
of of Mg Mg
HFS
D
6.5
25 Mg
25Mg
photons
HFS
of of
HFS
6.5 MHz
A(S1/2) = 596.5(5)
photo multiplier
300
350
fine Doppler tuning voltage (V)
fine
+
+
Doppler tuning
voltage
Mg+ beam from
ISOLDE,
60keV
D
250
+
Scin
+/- 5kV
+
photons
+
GSI, Mainz, MPIK,
Münster, Tübingen
400
300
350
400
250
fine
Doppler
tuning
voltage
(V)
fine
Suitable for longer lived
(>1s) and stable isotopes
Measure:
- HFS ->  and Q
- isotope shift -> r 2
Technically challenging: Frequency-comb based spectroscopy and high-voltage calibration.
COLLAPS harvest (GSI, Mz, MPIK, Tüb)
Proposals at COLLAPS:
Data Taking, in Preparation, Just Completed
2008 – 2010:
15 Publications (6 x Phys. Rev. Lett)
3 PhD and 3 master theses (Mainz + MPIK)
+ 2 PhD + 1 Master (Leuven, Manchester)
Pr
Cd
K
Cu, Ga, Zn
Mg
Be
IS517 (Ch. Geppert, Mainz)
IS497 (D. Yordanov, MPIK)
IS439 (K. Flanagan, CERN) PRL 103, 142501 (2009)
IS457 (B. Cheal, Manch.) PRL 104, 252502 (2010)
IS519 (B. Cheal, Manch.) PRC 82, 051302(R) (2010)
IS427, IS480 (G. Neyens, Leuven) PRC 77, 044307 (2008)
IS480 (K. Blaum, MPIK Heidelberg) PLB 678,465 (2009)
IS449 (W. Nörtershäuser & Ch. Geppert, Mainz) PRL 102, 062503 (2009)
Charge radii of 11,12Be (W. Nörtershäuser, Mz)
IS 484: Disappearance of the N=8 shell closure from comparison of Be charge radii
with fermionic molecular dynamics calculations.
intruder
11Be:
12Be:
W. Nörtershäuser,et al; Phys. Rev. Lett. 102, 062503 (2009)
A. Krieger, T. Neff et al., submitted to Phys. Rev. Lett.
ISOLTRAP: Penning trap mass spectrometry
B
B
q/m
q/m
end cap
z0
r0
ring
electrode
Remarkable:
accessible half-life: t1/2 ~ 10ms
required yield:
0.5 ions / s
achieved precision: dm/m = 2x10-9
Dresden, Greifswald, GSI, MPIK
ISOLTRAP Highlights
(L. Schweikhard, Greifswald; K. Zuber, Dresden; K. Blaum, MPIK)
Dresden, Greifswald,
GSI, MPIK
New Proposals:
IS498 (Sm, Eu, Gd)
IS513 (Tl, Hf)
IS518 (At, Au, Fr)
W. Geithner et al., Phys. Rev. Lett., 101, 252502 (2008)
M. Breitenfeld et al., Phys. Rev. C 80, 035805 (2009)
R.B. Cakirli et al., Phys. Rev. Lett., 102, 082501 (2009)
D. Neidherr et al., Phys. Rev. C., 80, 044323 (2009)
D. Neidherr et al., Phys. Rev. Lett., 102, 112501 (2009)
M. Breitenfeld et al., Phys. Rev. C 81, 034313 (2010)
S. Eliseev et al., Phys. Lett. B 693, 426 (2010)
S. Naimi et al., Phys. Rev. Lett. 105, 032502(2010)
Neutrino masses and traps
Neutrinoless double decay:
(A,Z)  (A,Z+2) + 2 e-
0
11 Isotopes with Q-value larger than 2 MeV
Signal: Peak at the Q-value of the transition
Aim: Measure all of them with < 1 keV accuracy
Example: 110Pd
D. Fink et al., Phys. Rev. Lett. accepted
Isotope
AME 2003
Q-values 2011
Ca-48
4272 ± 4
4272 ±4
Ge-76
2039.006 ±0.050
2039.006 ± 0.050
Se-82
2995.5 ± 1.9
2995.5 ± 1.9
Zr-96
3347.7 ±2.2
3347.7 ± 2.2
Mo-100
3035 ±6
3034.40 ± 0.17
Pd-110
2004 ±11
2017.85±0.64
Cd-116
2809 ± 4
2813.50 ±0.13
Sn-124
2287.8±1.5
2287.8 ±1.5
Te-130
2530.3 ±2.0
2527.518± 0.013
Xe-136
2462 ±7
2457.83±0.37
Nd-150
3367.7 ±2.2
3371.38 ± 0.20
The WITCH experiment
at ISOLDE/CERN
Leuven, Caen,
Darmstadt, Karlsruhe,
Mainz, Rez, Münster
Precision measurement of the
e--angular correlation “a“
a = 1 is favored
aF
aGT
WITCH – Universität Münster
2
2

CS  + CS ' 
 1
2
2  CV 
2
2
1  CT  + CT '  
  1 

2
3
2  C A 

The WITCH experiment
at ISOLDE/CERN
Leuven, Caen,
Darmstadt, Karlsruhe,
Mainz, Rez, Münster
Precision measurement of the
e--angular correlation “a“
a = 1 is favored
aF
aGT
WITCH – Universität Münster
2
2


CS3 beam
+ Ctimes
'
with
S
 1
in 2011 2
2  CV 
35Ar
2
2
1  CT  + CT '  
  1 

2
3
2  C A 

REX-ISOLDE: Post-accelerated ion beams
• 300 keV/u to 3 MeV/u
• isomeric beams due to RILIS
• acceleration scheme works
from Li to Ra
Darmstadt, Köln, München
MINIBALL @ REX-ISOLDE experiments
T. Kröll/N. Pietralla, TUD, R. Krücken/D. Mücher, TUM,
J. Jolie/P. Reiter, UK
Quadrupole Collectivity around 132Sn
Shape coexistence around Pb
g-factors
MINIBALL Results
Towards
100Sn
Oblate shapes?
molecular beams
Shell evolution N=40 to N=50
isomeric beam, in-trap decay
Island of Inversion
Island of Inversion
PLB, 700 ( 2011) 181
PRL105, 252501 (2010)
PRL103, 012501 (2009)
PLB 647, 237 (2007)
PRL 94, 172501 (2005)
Shell evolution
PRC 82, 064309 (2010)
PRC 79, 014309 (2009)
PRC 78, 047301 (2008)
PRL 100, 112502 (2008)
PRL 99, 142501 (2007)
PRL 98, 122701 (2007)
Towards 100Sn
EPJ. A 44 (2010) 355
PRC 80, 054302 (2009)
PRL 101, 012502 (2008)
PRL. 98, 172501 (2007)
Oblate shapes
PRL 98, 072501 (2007)
Transfer-reactions at MINIBALL
(R. Krücken/D. Mücher, TUM
T. Kröll/N. Pietralla, TUD)
Study of shell evolution in neutron-rich nuclei
using one- and two-neutron transfer reactions
IS499: t(44Ar,p)46Ar K. Wimmer, TUM, MSU
IS510: t(72Zn,p)74Zn D. Mücher, TUM
t(30Mg,32Mg)p
1058 keV
E2
K. Wimmer et al.; PRL 105, 252501 (2010): t(30Mg,32Mg)p
E0(?)
T-REX detectors
g-Spektroscopy with MINIBALL (P. Reiter, Köln)
31Mg
Coulex PLB, 700 ( 2011) 181
31Mg
MINIBALL
30Na
((3+) → 2+)
30Na


Particle
detection
30Na
((4+) → (3+))
30Na
((4+) → 2+)
•Odd isotopes in island
of inversion provide most
stringent and sensitive
tests of large scale shell
model calculations
•Ongoing program at
Coulex and transfer
30,31Na, 33Mg
Aktuelle Projekte
Gruppe Kröll, Gruppe Pietralla
Senior Investigators: M. Scheck, J. Leske, G. Rainovski (Humboldt fellow)
Laufende und in Analyse befindliche Experimente:
 Collective excitations of radioactive isotopes in Coulomb excitation
(IS 411, 452, 465, 475, 477, 496)
 n-transfer @ island of inversion (IS 502)
 magnetic moments in neutron-rich isotopes (IS 415, 483)
Masserekord für ISOL-RIB
Machbarkeit von E3-Coulex an ISOL-RIB
Messung magnetischer Momente
kurzlebiger angeregter Zustände
an REX-ISOLDE demonstriert: RIB 138Xe
Nuclear structure of n-rich Kr (J. Jolie, Köln)
A~100 mass region: phase shape
transitions from spheric to
deformed nuclei.
E(2+1) and B(E2;2+10+1) studies
New result for the energy of the 2+1 state in 96Kr
2500
1500
+
E(2 1) [keV]
2000
1000
500
0
50
52
54
56
58
60
62
64
62
64
number of neutrons
New B(E2) values for 92,94Kr and 96Kr
Sr Zr
250
Ru
Mo
200
66
52
54
56
58
60
62
64
B(E2) [W.u.]
50
Number of neutrons
Zr
Sr
Kr
150
100
50
Smooth transition from spheric
to deformed nuclear shapes in
the neutron-rich Kr region.
S. Naimi et al., Phys. Rev. Lett. 105 (2010) 032502
0
7.4
6.7
 B(E2)96 Kr  33.4
W.u.
50
52
54
56
58
60
number of neutrons
M. Albers et al., Phys. Rev. Lett. submitted
The HIE-ISOLDE project
• Increase of REX-ISOLDE energy (up to 10 MeV/u)
• Increase of primary beam intensity (LINAC4, 6A)
• Improvement of secondary beam production efficiency
(RILIS, new frontends and targets)
• Improvement of beam purity (RILIS/LIST)
• Improvement of beam optical quality (ISCOOL)
Heavy-ion storage ring TSR at MPIK
In operation: since 1988
Circumference: 55 m
Vacuum: ~10-11 mbar
Acceptance: 120 mm mrad
Multi-turn injection: mA
current
Electron cooler
Electron target
RF (de)acceleration
Typical energy 12C6+:
6-10 MeV/u
Lifetime: hours
Ion Storage Ring TSR, http://www.mpi-hd.mpg.de/blaum/storage-rings/tsr/index.en.html
Time schedule:
- End of operation of TSR in 12/2012
- Preparation for a move of the TSR to ISOLDE in 2013
- Installation of the TSR at ISOLDE as soon as the building is ready
Summary
• ISOLDE is one of the most active places for
experiments with radioactive ion beams.
• Interest to perform experiments at ISOLDE
is increasing.
• German groups obtained numerous scientific
highlights at ISOLDE in recent years.
• HIE-ISOLDE and TSR@ISOLDE offers
unique perspectives.
Thanks a lot to many colleagues who provided material.