Interpretation of the large-deformation high spin bands in selected A=158-168 nuclei

Abstract

The high-spin rotational bands in 168Hf and the triaxial bands in Lu nuclei are analyzed using the configuration-constrained Cranked Nilsson-Strutinsky (CNS) model. Special attention is given to the up-sloping extruder orbitals. The relative alignment between the bands which appear to correspond to triaxial shape is also considered, including the yrast ultra-high spin band in 158Er. This comparison suggests that the latter band is formed from rotation around the intermediate axis. In addition, the standard approximations of the CNS approach are investigated, indicating that the errors which are introduced by the neglect of off-shell matrix elements and the cut-off at 9 oscillator shells (N_{max}=8) are essentially negligible compared to other uncertainties. On the other hand, the full inclusion of the hexadecapole degree of freedom is more significant; for example it leads to a decrease of the total energy of ~ 500 keV in the TSD region of 168Hf.

Submitted to Physical Review C 20 pages, 18 figures

References in corpus (4)

• Description of rotating $N=Z$ nuclei in terms of isovector pairing
• Quadrupole Moments of Collective Structures up to Spin $\sim$ $65\hslash$ in ${}^{157}$Er and ${}^{158}$Er: A Challenge for Understanding Triaxiality in Nuclei
• Self-consistent tilted-axis-cranking study of triaxial strongly deformed bands in ${}^{158}$Er at ultrahigh spin
• Evidence for Shape Co-existence at medium spin in 76Rb

Cited by in corpus (3)

• Description of 158Er at ultrahigh spin in nuclear density functional theory
• Kerman-Onishi conditions in self-consistent tilted-axis-cranking mean-field calculations
• Interpretation of normal-deformed bands in 167Lu