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

Adopted spectroscopic information on 0i+→0f+ pure E0 transitions has been deduced by critical evaluation of the available experimental data for all even-even nuclei ranging from 42He2 to 25098Cf152. Values of qK2(E0/E2), the ratio of the K-conversion electron intensity of the 0i+→0f+, E0 transition to that of the 0i+→21+, 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, ρ2(E0), has been deduced using the best available 0+-level half-lives and branching ratios.