Compilation and evaluation of experimental α_K values of pure E2 transitions in the light of existing theoretical calculations

Most widely used Internal Conversion Coefficients (ICCs) data tables are those of Hager and Seltzer, Rosel et al and Band and Trzhaskovskaya. Although theoretical ICCs differ as a consequence of the model adopted by the authors, details of the physical assumptions, inadequate knowledge of some quantities involved in the computations and approximations made in the code, agreement among the calculated data can be remarkably good, varying by less than a few percent and generally less than 5%. Various analysts, Campbell and Martin, Raman et al. have pointed out the differences between equivalent tabulations and between calculated and experimental ICC values. Whatever deviations that have been reported earlier have been brought down by the theoretical calculations of BRICC. No systematic deviations could be found in terms of transition energy, atomic number etc. We confidently recommend the BRICC tables for theoretical ICCs using BRICC code for interpolation. BRICC are the best theoretical ICC calculations. Now with the new theoretical calculation of BRICC, it has become possible to explain the systematic discrepancy problem raised by many authors over the years. If at all discrepancies exist in some case they are not systematic but can be attributed to multipole mixing