Bonn 2020 – wissenschaftliches Programm

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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.

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