Nuclear lifetimes for cluster radioactivities

Abstract

Calculated partial half-lives and Q values of the most probable decays by spontaneous cluster emission are listed for nuclides with Z = 52–122. Superheavy nuclei and nuclei far off the β-stability line are included; input mass values are from the mass tables published in 1988 in Atomic Data and Nuclear Data Tables (Vol. 39, No. 2). Parent nuclei listed here are selected to meet the following criteria: partial lifetime for cluster emission <10 30 s and branching ratio relative to α decay >10 −18. α-decay Q values and partial half-lives are given for all nuclei listed. A larger set of parent nuclei are presented in a T EX file, where half-lives <10 50 s and branching ratios >10 −30 are accepted provided the mass of the parent nucleus has been measured or estimated from systematics by Wapstra et al. The lifetimes for cluster emissions are calculated using the analytical superasymmetric fission model with even-odd effects taken into account; the lifetimes for α decay are experimental values or are deduced from a semiempirical formula.