Systematic study of .ALPHA. decay half-lives of doubly odd nuclei within the two-potential approach

alpha decay is a common and important process of natural radioactivity of the heavy and superheavy nuclei. From the alpha decay of nuclei, we can obtain much more information of nuclei structure. In our previous works [X.-D. Sun et al., Phys. Rev. C 93, 034316 (2016); X.-D. Sun et al., ibid. 95, 014319 (2017)], we have done systematic study on the alpha preformation probability of both the even-even and odd-A nuclei within the two-potential approach. The alpha preformation probabilities will systematically change due to the shell effect, proton-neutron correlation, and so on. This work is the extension of the previous works. In this work, we systematically study the alpha decay of doubly odd nuclei. We find that for superallowed alpha decay the alpha preformation probabilities of doubly odd nuclei are larger than those of odd-A ones in general, and for the heavier nuclei the extra neutrons suppress the proton-neutron correlation resulting in the small alpha preformation probabilities. The calculated results can well reproduce the experimental half-lives. The half-lives of the alpha decay chain beginning from nuclide (296)119 are also predicted and compared with various empirical formulas.