Electric dipole moments of actinide atoms and RaO molecule

TL;DR

This paper calculates the electric dipole moments of actinide atoms and the RaO molecule, revealing their potential for enhanced sensitivity in fundamental symmetry tests compared to other systems.

Contribution

It provides the first detailed calculations of atomic EDMs induced by nuclear Schiff moments in actinides and explores their application in solid state and molecular experiments.

Findings

EDMs of 229Pa and 225Ac are significantly larger than those of Hg and Ra.

The EDM of 229Pa is 30,000 times larger than 199Hg EDM.

The T,P-odd interaction in RaO is 500 times larger than in TlF.

Abstract

We have calculated the atomic electric dipole moments (EDMs) induced in 229Pa and 225Ac by their respective nuclear Schiff moments S. The results are d(229Pa)= - 9.5 10^{-17} [S/(e fm)] e cm= - 1.1 10^{-20} \eta e cm; d(225Ac})=- 8.6 10^{-17} [S/(e fm)] e cm=- 0.8 10^{-21} \eta e cm. EDM of 229 Pa is 3 10^4 times larger than 199Hg EDM and 40 times larger than 225Ra EDM. Possible use of actinides in solid state experiments is also discussed. The T,P-odd spin-axis interaction in RaO molecule is 500 times larger than in TlF.