Internal Conversion Coefficients for Observed Low-Energy Gamma Transitions

The total internal conversion coefficients for experimentally observed low-energy ( E_γ≲ 10 keV) gamma transitions are calculated. The resulting values are presented for those transitions where they differ substantially from the theoretical internal conversion coefficients quoted on the Brookhaven National Laboratory website of nuclear data (www.nndc.bnl.gov/nudat2/ensdf/) or are absent there. More than 60 such transitions are revealed. Possible reasons behind the errors in the values of the internal conversion coefficients on this nuclear data website are analyzed. The present calculations are performed by the Dirac–Fock method, and the exchange interaction both between bound electrons and between bound and free electrons is taken exactly into account in these calculations. The vacancy in an atomic shell after conversion is taken into account in the approximation of frozen orbitals. The internal conversion coefficients calculated in this way agree well with reliable experimental data. Special features in the behavior of the partial and total internal conversion coefficients at low transition energies are considered.