Internal conversion coefficients for all atomic shells

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Abstract

Presented here are tables of gamma-ray internal conversion coefficients for all atoms with 30 ≤ Z ≤ 104. Values are given for the multipolarities E1,…,E4 and M1,…,M4, for each occupied atomic shell and for the whole atom. Gamma energies between 2 keV and 5 MeV above threshold for the K-shell and between 2 keV and 1.5 MeV for all other shells are covered.

These tables supersede those of Hager and Seltzer, of Dragoun, Pauli, and Schmutzler, and of Dragoun, Plajner, and Schmutzler. While the values differ very little from those of Hager-Seltzer in the K, L, and M shells except for the L1 and M1 shells and except near threshold, they vary markedly from those of all the other authors in the higher shells. It seemed worthwhile therefore to present a complete new set calculated in a consistent way for all shells. A finer grid, more convenient for interpolation, has been employed and known errors have been eliminated. Calculations were based on relativistic Hartree-Fock-Slater wavefunctions with the coefficient C = 1 for the exchange term and on the assumption that the potential is the same for all electrons, including the emitted one. Experimental binding energies were used. Finite nuclear size is taken into account, but the penetration terms are not tabulated. A table compares this model with those adopted by other authors. Checks made with other programs and other models show that discrepancies are due to the models and not to the calculations.

The corrections neglected are those of order higher than the second in perturbation theory; thus the values presented can be considered as “basic” ones to which corrections of higher order can be added as it becomes clear how to calculate them best. ICC Values for Z = 30−Z= 67 are in the preceeding issue, Nos. 2,3, ICC Values for Z = 68−Z= 104 are in this issue, Nos. 4,5

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