From chiral vibration to tilted-axis wobbling within broken chiral symmetry

The effect of non-axial rigid alignment of the quasiparticle spins on the behaviour of the chiral partner bands is investigated within a semiclassical treatment of a particle-rotor Hamiltonian. A valence h(11/2) proton particle and a h(11/2) neutron hole are used to calculate the energy spectrum of the chiral partner bands as a function of the angles defining the rigid alignments of the quasiparticle spins. Distinct dynamical characteristics are identified in specific angular momentum ranges and tilting angles. It is found that the high spin static chirality regime transforms into a wobbling tilted axis rotation at sufficiently high deviations of the quasiparticle spins from the principal intrinsic axes. The experimental realization of the model is exemplified for the chiral bands of Pr-132 and Pm-138. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

The study investigates the effect of non-axial rigid alignment of quasiparticle spins on the behavior of chiral partner bands using a semiclassical treatment. Distinct dynamical characteristics are identified in specific angular momentum ranges and tilting angles. It is observed that the high spin static chirality regime transforms into a wobbling tilted axis rotation under certain conditions.