Theory of multistep statistical decays in chains of genetically related nuclei

Abstract

Systems of kinetic equations for decay chains of genetically related nuclei, the R-matrix theory of nuclear reactions with formation of unstable particles, and a diagram technique with Green’s function are used to study the general form for the widths of n-step statistical decays of parent nuclei that are in quasi-stationary resonance states. Conditions under which sequential and virtual decays occur are analyzed. Cases where interactions between particles emitted at different stages of processes must be allowed for are considered. Processes related to fissile nuclei that simultaneously emit three or more particles are discussed.