Triaxial projected shell model study of gamma-vibrational bands in even-even Er isotopes

Abstract

We expand the triaxial projected shell model basis to include triaxially-deformed multi-quasiparticle states. This allows us to study the yrast and gamma-vibrational bands up to high spins for both gamma-soft and well-deformed nuclei. As the first application, a systematic study of the high-spin states in Er-isotopes is performed. The calculated yrast and gamma-bands are compared with the known experimental data, and it is shown that the agreement between theory and experiment is quite satisfactory. The calculation leads to predictions for bands based on one- and two-gamma phonon where current data are still sparse. It is observed that gamma-bands for neutron-deficient isotopes of 156Er and 158Er are close to the yrast band, and further these bands are predicted to be nearly degenerate for high-spin states.

6 pages, 9 figures

References in corpus (5)

• Triaxial projected shell model approach
• Multi-Phonon $\gamma$-Vibrational Bands and the Triaxial Projected Shell Model
• Signature inversion -- manifestation of drift of the rotational axis in triaxial nuclei
• Transition quadrupole moments in gamma-soft nuclei and the triaxial projected shell model
• Nuclear magnetic dipole properties and the triaxial deformation

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