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

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 ₂⁴He₂ to ₉₈²⁵⁰ Cf₁₅₂. Values of q_K²(E0/E2), the ratio of the K-conversion electron intensity of the 0_i⁺ → 0_f ⁺, E0 transition to that of the 0_i⁺ → 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, p²(E0), has been deduced using the best available 0⁺-level half-lives and branching ratios.