Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 17: Structure and Dynamics of Nuclei 4
HK 17.3: Vortrag
Montag, 23. März 2015, 17:45–18:00, T/SR14
Combined analysis of Coulex and lifetime measurements: Neutron-rich Xe isotopes — •Corinna Henrich, Stoyanka Ilieva, Thorsten Kröll, and Sabine Bönig — Institut für Kernphysik, TU Darmstadt, Germany
The region around the doubly magic nucleus 132Sn is of special interest as both single-particle and mean-field approaches can be applied by theory. In order to gain further understanding of
the nuclear structure in this region, we studied the even-even neutron-rich 138−142Xe isotopes.
Two experiments were carried out. "Safe" Coulomb excitation was done at REX-ISOLDE (CERN,
Geneva) using the MINIBALL spectrometer (IS411 campaign). In addition, picosecond lifetimes of
excited states, populated following the neutron-induced fission of 235U and
241Pu, were directly measured at the experimental reactor of ILL (Grenoble) using the
EXILL&FATIMA spectrometer. The obtained lifetimes can be used for a more comprehensive analysis of the data available from the Coulex
experiment. Therefore, not only the B(E2) transition probability can be determined, but also the
quadrupole moments of the 2+ excited states, which are otherwise not accessible for short-lived
states. Thus, the evolution of quadrupole collectivity above Z=50 and N=82 is studied and the results are
compared with the predictions by several theoretical models.
Supported by BMBF under contracts 06DA9036I, 05P12RDCIA and
05P12RDNUP, by the EU under contracts EURONS 506065 and EN-
SAR 262010, by ILL and by HIC for FAIR.