Hyperfine induced $1s2s ^1S_0 \to 1s^2 ^1S_0$ M1 transition of He-like ions

TL;DR

This paper calculates hyperfine induced M1 transition probabilities in He-like ions using relativistic wavefunctions, including Breit and QED effects, providing data useful for future experiments on fundamental physics.

Contribution

It introduces a comprehensive calculation of hyperfine induced transitions in He-like ions, incorporating Breit and QED effects, and provides a general scaling law for decay rates across isotopes.

Findings

Results for Eu-151 and Gd-155 agree with previous studies.

Provides a scaling law for hyperfine decay rates based on nuclear properties.

Data supports future experimental tests of QED and parity violation.

Abstract

Hyperfine induced $1s2s ^1S_0 \to 1s^2 ^1S_0$ M1 transition probabilities of He-like ions have been calculated from relativistic configuration interaction wavefunctions including the frequency independent Breit interaction and QED effects. Present results for {$^{151}$}Eu and {$^{155}$}Gd are in good agreement with previous calculations [Phys. Rev. A {\bf 63}, 054105 (2001)]. Electronic data are given in terms of a general scaling law in $Z$ that, given isotopic nuclear spin and magnetic moment, allows hyperfine induced decay rates to be estimated for any isotope. The results should be helpful for future experimental investigations on QED and parity non-conservation effects.