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

Abstract

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 h11/2 proton particle and a h11/2 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 132Pr and 138Pm.