$α$-decay half-lives of superheavy nuclei with $Z=122-125$

Abstract

For $α$ decay half-life calculations in this work, the Coulomb and proximity potential model with a new semiempirical formula for diffuseness parameter developed in previous work [Phys. Rev. C 100, 024601 (2019)] is used. The present model in this work is compared with the generalized liquid-drop model (GLDM), universal decay law (UDL), and experimental half-lives in the region $Z=104-118$. Next, the predicted half-lives of 51 superheavy nuclei (SHN) with $Z=122-125$ by the present model are compared with those of GLDM, and UDL. The present model is revealed to be more accurate in reproducing experimental half-lives compared to GLDM and UDL. Moreover, it is found that the predictions of the present model and UDL are highly consistent while GLDM largely deviates from the other two. A study of the competition between $α$ decay and spontaneous fission (SF) shows that $α$ decay is the dominant mode. Among the studied SHN with $Z=122-125$, ${}^{295-307}122$ and ${}^{314-320}125$ are identified as potential candidates whose half-lives are relatively long enough to be experimentally detected in the future through their $α$-decay chains. The identified candidates are in good agreement with other recent work.