Prolate-to-oblate transition and backbending along the yrast line induced by quasiparticle alignment

Abstract

The yrast lines in Kr isotopes with $N=42$, 44, and 46 are investigated in a beyond mean field framework with both prolate-oblate coexistence and quasiparticle alignment taken into account. Quasiparticle orbitals with high-$j$ and low-$\Omega$ on the oblate side are shown to be responsible for the sharp backbending observed in ${}^{82}$Kr, by driving the yrast shape from prolate to oblate. This suggests that quasiparticle alignment may not be neglected in the investigation of the shape evolution along the yrast line.

arXiv comment6 pages, 5figiures

References in corpus (9)

• Shape coexistence in neutron-deficient Kr isotopes: Constraints on the single-particle spectrum of self-consistent mean-field models from collective excitations
• A microscopic benchmark-study of triaxiality in low-lying states of 76Kr
• Beyond relativistic mean-field studies of low-lying states in neutron-deficient krypton isotopes
• Covariant description of shape evolution and shape coexistence in neutron-rich nuclei at N\approx60
• Structure of Krypton isotopes calculated with symmetry conserving configuration mixing methods
• Projected shell model study for the yrast-band structure of the proton-rich mass-80 nuclei
• Anomalous rotational-alignment in N=Z nuclei and residual neutron-proton interaction
• Triaxial shape fluctuations and quasiparticle excitations in heavy nuclei
• Shape vibrations and quasiparticle excitations in the lowest 0+ excited state of the Erbium isotopes