Ab initio study of radium monofluoride, RaF, as a candidate to search for P- and T,P- violation effects

TL;DR

This study uses relativistic ab initio calculations to evaluate RaF's potential for detecting P- and T,P-violating interactions, providing key parameters for experimental searches of fundamental symmetry violations.

Contribution

It presents the first comprehensive calculation of P- and T,P-odd interaction parameters for RaF, including spectroscopic and hyperfine constants, aiding experimental efforts to detect symmetry violations.

Findings

Calculated key P- and T,P-odd interaction parameters for RaF.

Provided spectroscopic and hyperfine constants validating the methods.

Demonstrated RaF's suitability for experimental searches of fundamental symmetry violations.

Abstract

Relativistic ab initio calculations have been performed to assess the suitability of RaF for experimental search of P- and T,P-violating interactions. The parameters of P- and T,P-odd terms of the spin-rotational Hamiltonian have been calculated for the ${^2}\Sigma$ electronic ground state of RaF molecule. They include the parameter $W_a$, which is critical in experimental search for nuclear anapole moment and the parameters $W_d$ and $W_{\rm SP}$ required to obtain restrictions on the electric dipole moment of the electron and T,P-odd scalar-pseudoscalar interactions, respectively. The parameter $X$ corresponding to the "volume effect" in the T,P$-$odd interaction of the $^{223}$Ra nuclear Schiff moment with electronic shells of RaF has also been computed. Spectroscopic and hyperfine structure constants for $^{223}$RaF and $^{223}$Ra$^+$ have been computed as well, demonstrating the accuracy of the methods employed.