The Cranking Shell Model Analysis for the Yrast Band of ⁸⁷Nb

The back bending phenomenon observed in ⁸⁷Nb is interpreted very well within the approach of the triaxial cranking shell model (CSM) with the deformations determined by a total routhian surface calculation which includes the deformation drive of the high j quasiparticle orbits. It is suggested that the CSM is still valid for slightly deformed transitional nuclei if the configuration dependence of deformations is taken into account properly.