Calculations of the spectra of superheavy elements E119 and E120+

TL;DR

This paper presents high-precision relativistic calculations of the energy spectra of superheavy elements E119 and E120+, incorporating correlation effects, Breit interaction, QED corrections, and isotope shifts, validated against lighter analogs.

Contribution

It introduces a comprehensive all-order correlation correction method combined with relativistic and QED effects for superheavy elements, improving accuracy over previous models.

Findings

Accurate energy levels for E119 and E120+ calculated.

Correlation, Breit, and QED effects significantly influence spectra.

Validation against lighter elements confirms method reliability.

Abstract

High-precision calculations of the energy levels of the superheavy elements E119 and E120+ are presented. Dominating correlation corrections beyond relativistic Hartree-Fock are included to all orders in the Coulomb interaction using the Feynman diagram technique and the correlation potential method. The Breit interaction and quantum electrodynamics radiative corrections are considered. Also, the volume isotope shift is determined. A similar treatment for Cs, Fr, Ba+ and Ra+ is used to gauge the accuracy of the calculations and to refine the ab initio results.