Tübingen 2003 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 7: Kern- und Teilchen-Astrophysik I
HK 7.8: Talk
Monday, March 17, 2003, 18:00–18:15, F
Nuclear Structure Surprises around 132Sn — •Alexander Ostrowski1, Bernd Pfeiffer1, Karl-Ludwig Kratz1, William Walters2, and Andreas Woehr2 — 1Institut fuer Kernchemie, Fritz-Strassmann-Weg 2, 55128 Mainz — 2Dept. of Chemistry, University of Maryland
Explosive stellar nucleosynthesis is closely linked to the evolution of nuclear properties far from β-stability. Knowledge of T1/2, Pn and Q-values of such nuclei is vital to the predictive power of nuclear structure models used in this context. In particular, nuclear structure around magic neutron shell numbers, i.e. N=50, 82 and 126 is an indespensible ingredient in r-process calculations. To this end, we have studied experimentally Ag, Cd, In and Sn-Isotopes using the combined selectivities of neutron converter production target, RILIS and HRS at the ISOLDE-facility at CERN.
A series of surprising deviations from most recent nuclear structure predictions has been discovered including the unprecedentedly high energy of the first 1+-State in 130In, the behaviour of the rather high Qβ- and B(E2)-values in neutron-rich Cd-Isotopes and the low lying SP p- and d-states in 133Sn and 135Sb. The method, the data reduction, the experimental findings and their comparison with nuclear and astrophysical model predictions will be presented.