Investigation of the alpha-decay half-lives for even-even nuclei within a deformed two-potential approach

In this study, we systematically investigate the α-decay half-lives of 195 even-even nuclei using a deformed two-potential approach (TPA). The cosh potential with fixed diffuseness parameter is adopted as the nuclear potential, for which deformation parameters are taken from the FRDM, WS4, and DRHBc models. The root mean square deviations (RMSD) decrease from 0.515 to 0.385, 0.401, and 0.436, respectively, indicating that incorporating nuclear deformations allows the deformed TPA to accurately reproduce experimental α-decay half-lives. Furthermore, by fitting the diffuseness parameter across various mass regions, the RMSD is further reduced, from 0.385 to 0.330, 0.401 to 0.343, and 0.436 to 0.363. Additionally, the deformed TPA, combined with the fitted diffuseness parameter, is extended to predict the α-decay half-lives of even-even nuclei with Z = 118 and 120. The results suggest that N = 184 may be the next neutron magic number, following N = 126.