$\alpha$ decay is a common and important process of natural radioactivity of heavy and superheavy nuclei. The $\alpha$ decay half-lives for even-even nuclei from $Z=62$ to $Z=118$ are systematically studied based on the two-potential approach with a quasistationary state approximation. As for the nuclear potential, the isospin effect is considered, which slightly improves the results by 6.8%. To reduce the deviations between experimental half-lives and calculated results due to the nuclear shell structure, the analytic expression of hindrance factors is employed. Our results can reproduce the experimental half-lives as good as using the density-dependent cluster model and the generalized liquid drop model.

• Received 17 November 2015
• Revised 30 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.034316