Multi-quasiparticle rotational bands in neutron-rich erbium isotopes

Abstract

Multi-quasiparticle states and rotational bands in neutron-rich erbium isotopes have been investigated by the configurationconstrained pairing-deformation-frequency self-consistent total-Routhian-surface (TRS) method with particle-number-conserved pairing. Specifically, the recently observed K fy = 4− bands in 168,170,172Er have been found to experience a configuration change in our calculation. Some other multi-quasiparticle states with uncertain configuration assignments have been reinvestigated by calculating their collective rotations. The configuration-constrained TRS calculation can reproduce experimental data consistently.