Abstract
We present a systematic calculation of -decay half-lives of even-even heavy and superheavy nuclei in the framework of the preformed model. The microscopic -daughter nuclear interaction potential is calculated by double-folding the density distributions of both and daughter nuclei with a realistic effective Michigan three-Yukawa nucleon-nucleon interaction, and the microscopic Coulomb potential is calculated by folding the charge density distributions of the two interacting nuclei. The half-lives are found to be sensitive to the density dependence of the nucleon-nucleon interaction and the implementation of the Bohr-Sommerfeld quantization condition inherent in the Wentzel-Kramers-Brillouin approach. The -decay half-lives obtained agree reasonably well with the available experimental data. Moreover, the study has been extended to the newly observed superheavy nuclei. The interplay of closed-shell effects in -decay calculations is investigated. The -decay calculations give the closed-shell effects of known spherical magicities, and , and further predict enhanced stabilities at , and for , and , owing to the stability of parent nuclei against decays. It is worth noting that the aim of this work is not only to reproduce the experimental data better, but also to extend our understanding of -decay half-lives around shell closures.
- Received 28 October 2009
DOI:https://doi.org/10.1103/PhysRevC.81.024602
©2010 American Physical Society