Pseudospin symmetry and octupole correlations for multiple chiral doublets in 131Ba

TL;DR

This paper develops a reflection-asymmetric triaxial particle rotor model to study multiple chiral doublets with octupole correlations in 131Ba, successfully reproducing experimental data and exploring the evolution of chiral geometry and pseudospin-chiral structures.

Contribution

It introduces a novel model incorporating reflection asymmetry and quasiparticles to analyze chiral doublets with octupole correlations in 131Ba, providing new insights into their structure and geometry.

Findings

Reproduces energy spectra and transition ratios accurately.

Demonstrates evolution of chiral geometry with spin.

Suggests possible pseudospin-chiral quartet bands.

Abstract

A reflection-asymmetric triaxial particle rotor model with three quasiparticles and a reflection-asymmetric triaxial rotor is developed, and applied to investigate the observed multiple chiral doublets (M\c{hi}D) candidates with octupole correlations in 131Ba, i.e., two pairs of positive-parity bands D3-D4 and D5-D6, as well as one pair of negative-parity bands D7-D8. The energy spectra, the energy staggering parameters, the B(M1)/B(E2) ratios, and the B(E1)/B(E2) ratios are reproduced well. The chiral geometries for these M\c{hi}D candidates are examined by the azimuthal plots, and the evolution of chiral geometry with spin is clearly demonstrated. The intrinsic structure for the positive-parity bands is analyzed and the possible pseudospin-chiral quartet bands are suggested.