Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Struktur und Dynamik von Kernen
HK 11.6: Talk
Monday, March 17, 2014, 18:00–18:15, HZ 5
Evolution of Quadrupole Collectivity in the Neutron-rich Xe Isotopes — •Stoyanka Ilieva, Corinna Henrich, Thorsten Kröll, and Sabine Bönig for the IS411 and FATIMA collaboration — Institut für Kernphysik, TU Darmstadt
The nuclear properties in the region around the doubly magic nucleus 132Sn are of special interest. Theory relies on nuclei near closed shells for predicting other, more complex systems. The quadrupole collectivity in nuclei can be studied in Coulomb-excitation experiments. The excitation cross section depends on both transition and diagonal matrix elements, an effect known as reorientation. Therefore, direct measurements of lifetimes which depend only on one single transition matrix element, are often more precise. Furthermore, the additional constraints from lifetimes enable the better determination of quadrupole moments, a quantity otherwise hard to obtain for short-living states.
The isotopes 138,140,142,144Xe were studied by means of Coulomb excitation at the REX-ISOLDE facility at CERN. Recently, these studies were complemented by a measurement of the lifetimes of excited states in the xenon isotopes (138−144Xe), populated in neutron-induced fission of 235U and 241Pu. The experiment was part of the FATIMA campaign performed at ILL, Grenoble in early 2013. In this contribution we report on the results from these measurements, aiming to investigate the evolution of collectivity around Z=50 and N=82.
Supported by BMBF under contracts 06DA9036I, 05P12RDCIA and 05P12RDNUP, by the EU under contracts EURONS 506065 and ENSAR 262010, and by HIC for FAIR.