Quasiparticle and $\gamma$-band structures in ${}^{156}$Dy

Abstract

Excited band structures recently observed in ${}^{156}$Dy are investigated using the microscopic triaxial projected shell model (TPSM) approach and the quasiparticle random phase approximation (QRPA) based on the rotating mean-field. It is demonstrated that new observed excited bands, tracking the ground-state band, are the $\gamma$-bands based on the excited two-quasineutron configurations as conjectured in the experimental work.

12 pages, 12 figures

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