Mechanisms contributing toKelectron ejection in nuclearβdecay

Theoretical calculations of shake-off and shake-up autoionization probabilities for $K$ electrons are presented, using the formalism presented previously. Total $K$ electron ejection probabilities $P_K$ are obtained by summing shake-off and shake-up contributions. The role of direct collision is discussed. Agreement between these $P_K$ values and 33 recent experimental results produced by different techniques is generally good. The comparison permits critical assessment of the remaining weaknesses of the theory.