1. DPG Spring Meeting 2008 Darmstadt
Kernstrukturuntersuchungen an radioaktiven Isotopen mit Hilfe von a-Transfer-Reaktionen
J. Leske1
B. Alikhani, L. Coquard, T. Bloch, N. Pietralla
1Institut für Kernphysik, TU Darmstadt
A. Jungclaus, J. Walker, V. Modamio
Universidad Autonoma de Madrid
K.-H. Speidel
Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn
S. Pietri
University of Surrey
P. Doornenbal, J. Gerl, N. Goel, I. Kojouharov, W. Prokopowicz,
H. Schaffner, H.-J. Wollersheim
GSI, Darmstadt
J. Cederkall, A. Ekstroem
University of LUND
R. Schwengner
FZ Rossendorf
R. Gernhäuser, P. Maier-Komor
TU München
Institut für Kernphysik, TU Darmstadt

2. Introduction & Motivation
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Introduction & Motivation
RIKEN (Japan)
GSI
exploration of the entire nuclear landscape
CERN (Europe)
pn interaction
MSU (USA)
need for radioactive
ion beam facilities
nn force
TRIUMF (Canada)
nuclear models
GANIL (France)
Institut für Kernphysik, TU Darmstadt

3. F exp = Gbeam F lin g Transient magnetic fields
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Transient magnetic fields
stable beam
excited ion with aligned nuclear spin
travels through polarized
ferromagnetic environment
polarized electrons and aligned nuclear spin
empirical parametrization required !
linear parametrisation with
ion beam induced attenuation
F exp = Gbeam F lin g
Institut für Kernphysik, TU Darmstadt

4. Particle-g- angular correlation
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
g-factor measurements using a transfer
Particle coincidence
spectrum
Particle-g- angular correlation
Institut für Kernphysik, TU Darmstadt

5. Particle gated g-coincidence spectra
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Particle gated g-coincidence spectra
two different nuclei studied simultaneously
rates comparable those of Coulex experiments
a transfer selective to low spin states
Institut für Kernphysik, TU Darmstadt

6. g factors and B(E2)‘s from a-transfer experiments
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
g factors and B(E2)‘s from a-transfer experiments Ti 44 22 Ti 52 22 30 Zn 62 30 32 Ge 68 32 36
T1/2 = 60 y
T1/2 = 1.7 m
T1/2 = 9.2 h
T1/2 = 271 d
S. Schielke et al., Phys. Lett. B 567 (2003) 153
K.-H. Speidel et al., Phys. Lett. B 633 (2006) 219
O. Kenn et al., Phys. Rev. C65 (2002)
J. Leske et al., Phys. Rev. C71 (2005)
Is a transfer also applicable for isotopes heavier than A = 68 ?
Institut für Kernphysik, TU Darmstadt

7. Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
UNILAC Experiment U234 (see also HK 48.7 from J. Walker)
“Measurement of the g-factors of 2+ states in stable A=112,114,116 Sn isotopes using the transient field technique”
4 Euroball Cluster at ±65°
natC
excitation layer natural carbon Gd Cu
112,114,116Sn*
112,114,116Sn + 12C
0.7
10.8
4.9
116,118,120Te*
mg/cm2
recoil detection
20°    45°
112,114,116Sn
@ 4 MeV/u
Institut für Kernphysik, TU Darmstadt

8. 114Sn 118Te 12C a counts E (keV) Prompt particle gated -ray spectra
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
UNILAC Experiment U234
Prompt particle gated -ray spectra
114Sn
51o
4+ → 2+
2+ → 0+
65o
79o
5- → 4+
3- → 2+
e-e+
counts
118Te
2+ → 0+
4+ → 2+
Si spectrum
12C
22+ → 2+
e-e+
6+ → 4+
counts a
E (keV)
channel
Institut für Kernphysik, TU Darmstadt

9. 112Sn/116Te 114Sn/118Te 116Sn/120Te counts E (keV) g spectra e-e+
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
g spectra
112Sn/116Te
e-e+
e-e+
114Sn/118Te
counts
e-e+
116Sn/120Te
E (keV)
Institut für Kernphysik, TU Darmstadt

10. PRELIMINARY Experimental Result (preliminary)
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Experimental Result (preliminary)
g(2 ) factors in 116,118,120Te +
lifetimes from DSAM analysis in 116,118,120Te 1
PRELIMINARY
P. Raghavan, At. Data Tables 42, 189 (1989)
Institut für Kernphysik, TU Darmstadt

11. a Transfer to radioactive Ion Beams !
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Summary
a Transfer observed in nuclei beyond A ~ 110
Proof of principle for g-factor and DSAM experiments using a transfer to stable nuclei in a mass region between 32 < A < 116
a Transfer to stable Ion Beams (examples)
Beam :
78Kr
86Kr
84Sr
96Ru
124Xe
136Xe
Isotope :
82Sr44
90Sr52
88Zr48
100Pd54
128Ba72
140Ba84
T1/2 :
25.5 d
28.5 y
83.4 d
3.6 d
2.4 d
12.8 d
More exotic nuclei by
a Transfer to radioactive Ion Beams !
Institut für Kernphysik, TU Darmstadt

12. Transient Field & DSAM Experiments
Kernstrukturuntersuchungen an radioaktiven Isotopen mit a-Transfer
Outlook
AGATA-Demonstrator (Legnaro)
Plunger Experiments
Precision lifetime study in the proton-rich 100Pd following Coulomb-barrier a-transfer reactions on 96Ru
Precision lifetime study in the neutron-rich 140Ba following Coulomb-barrier a-transfer reactions on 136Xe
1 symmetric cluster (prototype)
4 asymmetric cluster
36-fold segmented Ge cristalls
540 segments, 555 channels (digital)
photopeak efficiency 3 – 8 %
Transient Field & DSAM Experiments
UNILAC (GSI), Legnaro, REX-ISOLDE, GANIL
Institut für Kernphysik, TU Darmstadt