Bönig, Esther Sabine (2014)
Quadrupole collectivity in 128Cd.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung

Kurzbeschreibung (Abstract)

The regions around shell closures, especially around doubly magic nuclei, are of major interest in nuclear structure physics, as they provide a perfect test for nuclear structure theory. The neutron-rich Cd isotopes in the region of 132Sn are only two protons away from the shell closure at Z=50 and in close proximity to the N=82 magic number. Nevertheless they show an irregular behaviour regarding the excitation energy of the first excited 2+ state. This is not reproduced by shell model calculations, which is astonishing due to the proximity of the shell closures. In order to shed light on the much discussed region around doubly magic 132Sn, a Coulomb excitation experiment of 128Cd has been performed at REX-ISOLDE, CERN. The reduced transition strength B(E2;0+_gs → 2+_1), which is a measure of collectivity, and the spectroscopic quadrupole moment Q_s(2+_1) as a measure of deformation could be determined for the first time. The results are shown as the continuation of already measured neutron-rich Cd isotopes and are compared to both beyond mean field and shell model calculations, which give different predictions for these observables.

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