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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Structure and Dynamics of Nuclei VIII
HK 45.2: Vortrag
Donnerstag, 2. April 2020, 14:30–14:45, J-HS E
Lifetime measurement of excited states in octupole candidate 144Ce — •Marcel Beckers, Claus Müller-Gatermann, Alfred Dewald, Christoph Fransen, Alina Goldkuhle, and Franziskus von Spee — Institut für Kernphysik, Köln
In the N≈88, Z≈56 region several nuclei exhibit characteristics that are related to octupole correlations. With both neutron and proton numbers very close to these values, 144Ce is a good candidate for examining octupole deformation as well and indeed the literature reports a low-lying negative parity band which is attributed to this kind of deformation. To shed further light on the general structure, we performed a RDDS measurement to determine lifetimes of excited states in 144Ce. To populate the nucleus of interest the transfer reaction 142Ce(18O,16O) was used. The analysis which will be presented yielded a verification of the 21+ state lifetime as well as the first measurement of the lifetime of the 41+ and 61+ state and a lifetime limit for the 31− state. B(E2) values deduced from these lifetimes were used to compare them to shell model predictions. Furthermore B(E1) values for interband transitions have been determined to get indications about possible octupole deformation.