1. Bericht zu ISOLDE Low-energy precision experiments:
Laser Spectroscopy – COLLAPS
Mass Spectrometry – ISOLTRAP
Weak Interaction Studies – WITCH
Post-accelerated beam experiments:
REX-ISOLDE
HIE-ISOLDE
Peter Reiter
Universität zu Köln
KHuK Jahrestagung 2011
Physikzentrum Bad Honnef
  Dezember 2011

2. ISOLDE – Some statistics
ISOLDE-Collaboration: 13 member states + CERN
BMBF-Funding (~10% contribution to the ISOLDE collaboration):
German contribution to ISOLDE: t€ / year
to HIE-ISOLDE: t€ / year
>60 publications / year (among them ~10 Phys. Rev. Lett.)
>20 PhD students / year
Year Shifts requested Shifts scheduled Shifts delivered
~480 ~
~ ~
~650 ~
> 80%
high reliability!
1 shift = 8h of protons on the target
18 experiments out of 50 scheduled in 2011 have
spokesperson presently at a German institute.

3. The (HIE-)ISOLDE facility The ISOLDE facility
ISCOOL (Mainz, MPIK)
Hall extension
New targets
RILIS Upgrade (Mainz)
New target laboratory (class A lab)
GSI Darmstadt
MPIK Heidelberg
University Mainz
University Münster
University Tübingen
University Dresden
University Greifswald
University Bonn
University Darmstadt
University Köln
LMU Munich
TU Munich
WITCH

4. Upgrade ISOLDE/RILIS Lasersystems
(K. Wendt, Mz)
Bisheriges Farbstoff
Lasersystem
ISOLDE
Neues Titan:Saphir
Farbstoff-Laser Titan-Saphir-Laser
ISOLDE/RILIS Kabine - Panoramaansicht

5. Beam developments (K. Wendt, Mz)
Laser Ion Source Trap (LIST)
New astatine RILIS beams
highly selective laser ion source:
fully commissioned
at HRS front-end production of 21Na, 27Mg
highest selectivity (gain )
acceptable efficiency (loss 50)
preparation of purest ion beams!
Beam developments are of utmost importance for the success of ISOLDE.

6. COLLAPS: Collinear laser spectroscopy
GSI, Mainz, MPIK,
Münster, Tübingen
electrostatic
deflection
charge exchange cell (Na)
ion beam
Ekin<60 keV
electrostatic lenses for retardation
excitation & observation reg. +
laser beam
fixed frequency + +
fine
250 25 Mg
HFS of
300
350
fine Doppler tuning voltage (V)
400
photons D
6.5 o o
photo multiplier
Technically challenging: Frequency-comb based spectroscopy and high-voltage calibration.

7. 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
IS484 (G. Neyens, Leuven) Cd
IS517 (Ch. Geppert, Mainz) K
IS497 (D. Yordanov, MPIK)
Cu, Ga, Zn
IS439 (K. Flanagan, CERN) PRL 103, (2009)
IS457 (B. Cheal, Manch.) PRL 104, (2010)
IS519 (B. Cheal, Manch.) PRC 82, (R) (2010) Mg
IS427, IS480 (G. Neyens, Leuven) PRC 77, (2008)
IS480 (K. Blaum, MPIK Heidelberg) PLB 678,465 (2009) Be
IS449 (W. Nörtershäuser & Ch. Geppert, Mainz) PRL 102, (2009)

8. 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: W. Nörtershäuser,et al; Phys. Rev. Lett. 102, (2009)
12Be: A. Krieger, T. Neff et al., submitted to Phys. Rev. Lett.

9. ISOLTRAP: Penning trap mass spectrometryB
q/m
end cap
Remarkable:
accessible half-life: t1/2 ~ 10ms required yield: ions / s achieved precision: dm/m = 2x10-9
ring
electrode
Dresden, Greifswald, GSI, MPIK

10. 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, (2008)
M. Breitenfeld et al., Phys. Rev. C 80, (2009)
R.B. Cakirli et al., Phys. Rev. Lett., 102, (2009)
D. Neidherr et al., Phys. Rev. C., 80, (2009)
D. Neidherr et al., Phys. Rev. Lett., 102, (2009)
M. Breitenfeld et al., Phys. Rev. C 81, (2010)
S. Eliseev et al., Phys. Lett. B 693, 426 (2010)
S. Naimi et al., Phys. Rev. Lett. 105, (2010)

11. Neutrino masses and traps
Neutrinoless double decay:
(A,Z)  (A,Z+2) + 2 e 
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
Isotope
AME 2003
Q-values 2011
Ca-48
4272 ± 4
4272 ±4
Ge-76
±0.050
± 0.050
Se-82
± 1.9
Zr-96
±2.2
± 2.2
Mo-100
3035 ±6
± 0.17
Pd-110
2004 ±11
±0.64
Cd-116
2809 ± 4
±0.13
Sn-124
2287.8±1.5
±1.5
Te-130
±2.0
± 0.013
Xe-136
2462 ±7
±0.37
Nd-150
±2.2
± 0.20
Example: 110Pd
D. Fink et al., Phys. Rev. Lett. accepted

12. Leuven, Caen, Darmstadt, Karlsruhe,
The WITCH experiment
at ISOLDE/CERN
Leuven, Caen, Darmstadt, Karlsruhe,
Mainz, Rez, Münster
Precision measurement of the
e-n-angular correlation “a“
a = 1 is favored
WITCH – Universität Münster

13. Leuven, Caen, Darmstadt, Karlsruhe,
The WITCH experiment
at ISOLDE/CERN
Leuven, Caen, Darmstadt, Karlsruhe,
Mainz, Rez, Münster
Precision measurement of the
e-n-angular correlation “a“
a = 1 is favored
3 beam times with 35Ar
in 2011
PRELIMINARY
WITCH – Universität Münster

14. 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

15. MINIBALL @ REX-ISOLDE experiments
T. Kröll/N. Pietralla, TUD, R. Krücken/D. Mücher, TUM,
J. Jolie/P. Reiter, UK
Quadrupole Collectivity around 132Sn
g-factors
Shape coexistence around Pb
MINIBALL Results
Island of Inversion
PLB, 700 ( 2011) 181
PRL105, (2010)
PRL103, (2009)
PLB 647, 237 (2007)
PRL 94, (2005)
Shell evolution
PRC 82, (2010)
PRC 79, (2009) PRC 78, (2008)
PRL 100, (2008)
PRL 99, (2007)
PRL 98, (2007) 
Towards 100Sn
EPJ. A 44 (2010) 355
PRC 80,  (2009)
PRL 101, (2008)
PRL. 98, (2007)
 Oblate shapes
PRL 98, (2007)
Towards 100Sn
Oblate shapes?
molecular beams
Shell evolution N=40 to N=50
isomeric beam, in-trap decay
Island of Inversion

16. 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
E0(?) E2
1058 keV
T-REX detectors
K. Wimmer et al.; PRL 105, (2010): t(30Mg,32Mg)p

17. g-Spektroscopy with MINIBALL (P. Reiter, Köln)
31Mg Coulex PLB, 700 ( 2011) 181
31Mg
MINIBALL
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
30Na ((3+) → 2+)
30Na  
30Na ((4+) → (3+))
30Na ((4+) → 2+)
Particle detection

18. 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)
island of inversion (IS 502)
magnetic moments in neutron-rich isotopes (IS 415, 483)
Messung magnetischer Momente
kurzlebiger angeregter Zustände
an REX-ISOLDE demonstriert: RIB 138Xe
Masserekord für ISOL-RIB
Machbarkeit von E3-Coulex an ISOL-RIB

19. 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
Number of neutrons Sr Zr
New B(E2) values for 92,94Kr and 96Kr
Smooth transition from spheric
to deformed nuclear shapes in
the neutron-rich Kr region.
S. Naimi et al., Phys. Rev. Lett. 105 (2010)
M. Albers et al., Phys. Rev. Lett. submitted

20. The HIE-ISOLDE project
Increase of REX-ISOLDE energy (up to 10 MeV/u)
Increase of primary beam intensity (LINAC4, 6mA)
Improvement of secondary beam production efficiency (RILIS, new frontends and targets)
Improvement of beam purity (RILIS/LIST)
Improvement of beam optical quality (ISCOOL)

21. 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,
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

22. 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 offers unique perspectives.
Thanks a lot to many colleagues who provided material.