# Enhanced nuclear Schiff moment in stable and metastable nuclei

## TL;DR

This paper investigates how stable and long-lived nuclei with octupole deformations can significantly enhance nuclear Schiff moments, leading to stronger T and P violation signals in atomic EDM experiments, aiding CP-violation tests.

## Contribution

It provides estimates of enhanced Schiff moments and atomic EDMs in stable and long-lived nuclei with octupole deformation, expanding potential experimental targets.

## Key findings

- Enhanced Schiff moments in certain stable nuclei.
- Significant atomic EDMs predicted for molecules with these nuclei.
- Potential for improved CP-violation tests in atomic experiments.

## Abstract

Nuclei with static intrinsic octupole deformation or a soft octupole vibrational mode lead to strongly enhanced collective nuclear Schiff? moments. Interaction between electrons and these Schiff moments produce enhanced time reversal (T) and parity (P) violating electric dipole moments (EDM) in atoms and molecules. Corresponding experiments may be used to test CP-violation theories predicting T,P-violating nuclear forces and to search for axions. Nuclear octupole deformations are predicted in many short lived isotopes. This paper investigates octupole deformations in stable and very long lifetime nuclei such as 153Eu, 235U, 237Np and 227Ac, which can ease atomic experiments substantially. The estimates of the enhanced Schiff? moments, atomic electric dipole momentsand T, P-odd interaction constants in molecules containing these nuclei are presented.