Systematic study of favored \alpha-decay half-lives of closed shell odd-A and doubly-odd nuclei related to ground and isomeric states

摘要

In this work, we systematically investigate the favored $\alpha$-decayhalf-lives and $\alpha$ preformation probabilities of both odd-$A$ anddoubly-odd nuclei related to ground and isomeric states around the doubly magiccores at $Z=82$, $N=82$ and at $Z=82$, $N=126$, respectively, within atwo-potential approach from the view of the valence nucleon (or hole). Theresults show that the $\alpha$ preformation probability is linear related to$N_\text{p}N_\text{n}$ or $N_\text{p}N_\text{n}I$, where $N_\text{p}$,$N_\text{n}$, and $I$ are the number of valence protons (or holes), the numberof valence neutrons (or holes), and the isospin of the parent nucleus,respectively. Fitting the $\alpha$ preformation probabilities data extractedfrom the differences between experimental data and calculated half-liveswithout a shell correction, we give two analytic formulas of the $\alpha$preformation probabilities and the values of corresponding parameters. Usingthose formulas and the parameters, we calculate the $\alpha$-decay half-livesfor those nuclei. The calculated results can well reproduce the experimentaldata.