# Ground-state hyperfine splitting of B-like ions in high-Z region

## TL;DR

This paper provides a detailed theoretical analysis of the hyperfine splitting in B-like ions with high nuclear charge, employing advanced QED and computational methods to improve accuracy.

## Contribution

It introduces a comprehensive approach combining QED and configuration-interaction methods to evaluate hyperfine splitting in high-Z B-like ions.

## Key findings

- Accurate calculations of hyperfine splitting for Z=49-83.
- Inclusion of nuclear magnetization distribution effects.
- Evaluation of interelectronic interactions to all orders in alpha Z.

## Abstract

The hyperfine splitting of the ground state of selected B-like ions within the range of nuclear charge numbers $Z=49-83$ is investigated in detail. The rigorous QED approach together with the large-scale configuration-interaction Dirac-Fock-Sturm method are employed for the evaluation of the interelectronic-interaction contributions of first and higher orders in $1/Z$. The screened QED corrections are evaluated to all orders in $\alpha Z$ by using an effective potential. The influence of nuclear magnetization distribution is taken into account within the single-particle nuclear model.