α-Decay near the shell closure from ground and isomeric states

The modified two-potential approach (MTPA) is employed to study the exotic α-decay near the closed shells Z=82 and N=82, 126 within a deformed version of the cluster model. We perform systematic calculations on favored α-decay half-lives from both the ground states (g.s.) and the isomeric states (i.s.) by using the microscopic double-folding potential. The obtained α-decay half-lives are found to be in good agreement with the experimental data. This indicates that four types of α transitions among ground states and isomeric states (g.s. → g.s., g.s. → i.s., i.s. → g.s., i.s. → i.s.) are well described in a unified model. In addition, the unfavored α transitions in the Bi isotopes are investigated to pursue a further understanding of α-decay properties.