Abstract

Essential understanding about the structure of rotating nuclei has come from the study on the band crossings which are often associated with the alignment of a pair of quasiparticles. In this work, the first and second discontinuities in the low-lying rotational bands of $^{156 - 160}$ $^{156 - 160}$ Er nuclei have been investigated systematically, for the first time, within the paired cranked Nilsson–Strutinsky–Bogoliubov (CNSB) framework. Our calculations show these irregularities are related to the high-j intruder $i_{13 / 2}$ $i_{13 / 2}$ neutron and $h_{11 / 2}$ $h_{11 / 2}$ proton alignment, which is consistent with the previous studies within the cranked shell model (CSM) approach. A comparison was made with the experimental data where available, and good agreement is observed.

Keywords:

PACS: 21.10.−k, 21.60.−n, 21.10.Re

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