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Ab initio calculations of the 2p3/2→2s transition in He-, Li-, and Be-like uranium

A. V. Malyshev1, Y. S. Kozhedub1, and V. M. Shabaev1,2

  • 1Department of Physics, St. Petersburg State University, Universitetskaya 7/9, 199034 St. Petersburg, Russia
  • 2Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Center “Kurchatov Institute,” Orlova roscha 1, 188300 Gatchina, Leningrad region, Russia

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Phys. Rev. A 107, 042806 – Published 10 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.042806

Abstract

The bound-state QED approach is applied to calculations of the 2p3/2→2s transition energies in He-, Li-, and Be-like uranium. For U90+ and U89+, standard perturbation theory for a single level is employed, while the calculations of U88+ have required its counterpart for quasidegenerate levels. The utilized approach merges the rigorous QED treatment up to the second order of perturbation theory with the higher-order electron-correlation contributions evaluated within the Breit approximation. The higher-order screened QED effects are estimated by means of the model-QED operator. The nuclear recoil, nuclear polarization, and nuclear deformation effects are taken into account as well. Along with the transition energies, their pairwise differences are calculated. The comprehensive analysis of the uncertainties due to uncalculated effects is carried out, and the most accurate theoretical predictions, which are in perfect agreement with available experimental data, are obtained.

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Phys. Rev. A 107, 042806– Published 10 April, 2023
  • Received 11 February 2023
  • Accepted 21 March 2023
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