Systematic Cranked Shell Model Calculations for 87, 89, 91Br
Abstract
A systematic investigation of the odd-mass neutron-rich bromine isotopes 87-91Br has been carried out within the configuration-constrained cranked shell model (CSM) framework. The calculated kinematic moments of inertia and angular-momentum alignments reproduce the experimental trends with excellent agreement for the proposed quasiparticle configurations, thereby supporting the assigned band structures. The total Routhian surface calculations reveal pronounced γ-softness in 87Br, shape coexistence in 89-93Br, and a gradual prolate-to-oblate transition approaching N=56. These results demonstrate that the CSM provides a reliable description of rotational behavior and shape evolution in this mass region, achieving a better level of accuracy, while offering a transparent interpretation of quasiparticle configurations and shape-driving effects.
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