Selection rules of electromagnetic transitions for chirality-parity violation in atomic nuclei

TL;DR

This paper investigates nuclear Chirality-Parity violation using a reflection-asymmetric model, deriving electromagnetic transition rules and identifying experimental signatures like nearly degenerate bands.

Contribution

It introduces a new symmetry for ChP violation systems and derives specific electromagnetic transition selection rules, providing a framework for experimental identification.

Findings

Derived selection rules for electromagnetic transitions in ChP violation.

Identified fingerprints such as nearly degenerate quartet bands.

Examined these features in A=130 nuclei with specific shell configurations.

Abstract

The nuclear Chirality-Parity (ChP) violation, a simultaneous breaking of chiral and reflection symmetries in the intrinsic frame, is investigated with a reflection-asymmetric triaxial particle rotor model. A new symmetry for an ideal ChP violation system is found and the corresponding selection rules of the electromagnetic transitions are derived. The fingerprints for the ChP violation including the nearly degenerate quartet bands and the selection rules of the electromagnetic transitions are provided. These fingerprints are examined for ChP quartet bands by taking a two-$j$ shell $h_{11/2}$ and $d_{5/2}$ with typical energy spacing for $A=$ 130 nuclei.