# Isotope shifts of the $1s^22s2p(J)$ -$1s^22s^2$ transition energies in Be-like thorium and uranium

## TL;DR

This paper presents highly precise calculations of isotope shifts in Be-like thorium and uranium ions, accounting for relativistic, electron correlation, Breit, QED, nuclear deformation, and polarization effects.

## Contribution

It introduces a comprehensive computational approach combining multiple advanced effects to accurately predict isotope shifts in heavy ions.

## Key findings

- Calculated isotope shifts with high precision
- Quantified relativistic and correlation effects
- Included QED and nuclear corrections

## Abstract

Precise calculations of the isotope shifts in berylliumlike thorium and uranium ions are presented. The main contributions to the field and mass shifts are calculated within the framework of the Dirac-Coulomb-Breit Hamiltonian employing the configuration-interaction Dirac-Fock-Sturm method. These calculations include the relativistic, electron-electron correlation, and Breit-interaction effects. The QED, nuclear deformation, and nuclear polarization corrections are also evaluated.