Calculation of the hyperfine structure of the superheavy elements Z=119 and Z=120+

TL;DR

This paper presents ab initio calculations of hyperfine structure constants for superheavy elements Z=119 and 120+, including correlation, Breit, and QED effects, validated against lighter analogs.

Contribution

It introduces a comprehensive ab initio method for calculating hyperfine structures of superheavy elements, incorporating all significant physical effects.

Findings

Calculated hyperfine constants for Z=119 and 120+

Assessed the impact of nuclear radius on hyperfine constants

Validated methods with lighter element calculations

Abstract

The hyperfine structure constants of the lowest $s$ and $p_{1/2}$ states of superheavy elements Z=119 and Z= 120$^+$ are calculated using {\em ab initio} approach. Core polarization and dominating correlation effects are included to all orders. Breit and quantum electrodynamic effects are also considered. Similar calculations for Cs, Fr, Ba$^+$ and Ra$^+$ are used to control the accuracy. The dependence of the hyperfine structure constants on nuclear radius is discussed.