Wobbling excitations at high spins in A~160

TL;DR

This paper investigates the transformation of gamma-vibrational states into wobbling excitations at high spins in nuclei around mass 160, revealing shape transitions and gamma-deformation signs through transition analysis.

Contribution

It demonstrates the transformation of gamma-vibrational states into wobbling excitations post-backbending in specific nuclei, clarifying shape changes and gamma-deformation signs.

Findings

Gamma-vibrational states become wobbling excitations after backbending.

Shape transition from axially-symmetric to nonaxial occurs at high spins.

Sign of gamma-deformation is determined uniquely through transition analysis.

Abstract

We found that in 156Dy and 162Yb the lowest odd spin gamma-vibrational states transform to the wobbling excitations after the backbending, associated with the transition from axially-symmetric to nonaxial shapes. The analysis of quadrupole electric transitions determines uniquely the sign of the gamma-deformation in both nuclei after the transition point.