Systematic study of $\alpha$ decay half-lives for even-even nuclei within a two-potential approach

摘要

$\alpha$ decay is a common and important process for natural radioactivity ofheavy and superheavy nuclei. The $\alpha$ decay half-lives for even-even nucleifrom Z=62 to Z=118 are systematically researched based on the two-potentialapproach with a quasi-stationary state approximation. To describe thedeviations between experimental half-lives and calculated results due to thenuclear shell structure, a hindrance factor related with $\alpha$ particlepreformation probability is introduced. Our results can well reproduce theexperimental data equally to the density-dependent cluster model and thegeneralized liquid drop model. We also study the isospin effect of nuclearpotential in this work. Considering the isospin effect the calculated resultsimproved about 7.3$\%$.