Dirac–Fock internal conversion coefficients at low γ-ray energy

• Published in: Atomic data and nuclear data tables Vol. 140; p. 101426
• Main Authors: Trzhaskovskaya, M.B., Nikulin, V.K.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01-07-2021
• Subjects: Binding energy; Dirac–Fock method; Internal conversion coefficient; Low [formula omitted]-ray energy; Nuclear transition; Vacancy in atomic shell; Vacancy in atomic shell; Nuclear transition; Binding energy; Internal conversion coefficient; Low γ-ray energy; Dirac–Fock method
• ISSN: 0092-640X; 1090-2090
• DOI: 10.1016/j.adt.2021.101426

Presented here are internal conversion coefficients (ICCs) for nuclear transitions of low γ-ray energies from 0.1keV to 1keV in elements with 10≤Z≤118. The low-energy nuclear transitions attract significant interest since the novel experimental technique and methods make it possible to study the transitions as well as to discover new low-lying isomers. Our ICC calculations are shown to be in excellent agreement with experimental data for the fairly low-energy nuclear transitions. The calculations are based on the Dirac–Fock method. The vacancy in the atomic shell from which an electron has been emitted is taken into account in the framework of the frozen core approximation. Experimental binding energies are used for elements Z≤95. Theoretical binding energies obtained in a good approximation are used for Z≥96. Peculiarities of the ICC behavior at low energies are considered. The resonance-like structure of ICC and the drastic decrease in magnitude as the energy increases are demonstrated to be responsible for a pronounced dependence of ICC on theoretical assumptions underlying the calculations. We discuss the influence on the low-energy ICCs of the exact taking account the exchange interaction between electrons, the inclusion of the vacancy after conversion, and a credible choice of the binding energy.
•ICCs at low γ-ray energies from 0.1keV to 1keV are given for 10≤Z≤118.•Calculations were performed by the Dirac–Fock method.•The hole in an atomic shell after conversion was taken into account.•Peculiarities of the low-energy ICCs behavior are considered.•The ICC calculations are in agreement with available experimental data.