Abstract
The recent attempt to describe the low-spin excitations in some even Ge and Se nuclei self-consistently by symmetry-projected Hartree-Fock-Bogoliubov-type quasi-particle determinants (EXCITED VAMPIR model) is extended to the high-spin states in the 68Ge and 72Se isotopes. The shape coexistence explaining the properties of the low-spin states persists and manifests itself in the structure of the investigated high-spin bands. The coexistence of oblate and prolate deformed mean fields, dynamical changes of the hexadecapole deformations, and special alignments of the nucleons occupying the g 9 2 spherical shell lead to the prediction of a rather complex feeding pattern for the yrast band, including strong M1, ΔI = 0 transitions, some anomalous small intraband B( E2) transitions, and a particular trend of the g-factor values for different calculated bands. Though a couple of discrepancies remain, the overall agreement with the available experimental results is fairly good.
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