Electric monopole transitions between 0 + states for nuclei throughout the periodic table

Abstract

Adopted spectroscopic information on 0 i + → 0 f + pure E0 transitions has been deduced by critical evaluation of the available experimental data for all even–even nuclei ranging from 4 2 He 2 to 250 98 Cf 152 . Values of q K 2 ( E 0 / E 2 ) , the ratio of the K-conversion electron intensity of the 0 i + → 0 f + , E0 transition to that of the 0 i + → 2 1 + , E2 transition, have been determined. This procedure, together with the most recent theoretical coefficients for internal conversion and electron–positron pair creation, as well as electronic factors, produced a large number of new X(E0/E2) values, defined as the dimensionless ratio of the absolute B(E0) and B(E2) transition rates. The squared value of the monopole transition strength, ρ 2(E0), has been deduced using the best available 0 +-level half-lives and branching ratios.