$\ensuremath{\alpha}$ decay of nuclei in the range $67\ensuremath{\leqslant}Z\ensuremath{\leqslant}91$ from the ground state and isomeric state

$α$ decay of nuclei in the range $67 ⩽ Z ⩽ 91$ from the ground state and isomeric state

K. P. Santhosh, Jayesh George Joseph, and Sabina Sahadevan

Phys. Rev. C 82, 064605 – Published 17 December 2010

Abstract

The Coulomb and proximity potential model for deformed nuclei (CPPMDN) is used to study the favored and unfavored $α$ decay of nuclei in the range $67$ ⩽ $Z$ ⩽ $91$ from both the ground state (g.s.) and isomeric state (i.s.). The computed half-lives are in good agreement with experimental data. The standard deviation of half-life is found to be 0.44. Geiger-Nuttall (GN) plots for various parent isotopes are studied. It is found that all four types of transitions (g.s.→g.s., g.s.→i.s., i.s.→g.s., i.s.→i.s.) lie on a straight line. The isomeric state $α$ decay shows a behavior similar to that of the ground state and the nuclear structure of the isomeric states imitates that of the ground states. Some predictions are done for $α$ transition from both ground and isomeric states, which will be useful for future experiments.