n improved model for spherical proton emitters

In the present work, considering the effect of centrifugal potential on proton radioactivity, we propose an improved model to systematically evaluate the proton radioactivity half-lives of spherical proton emitters. The spectroscopic factor Sp has been considered in half-life calculation, determined by using the relativistic mean field (RMF) theory in conjunction with the BCS method based on the DD-ME2 force. The calculated half-lives can reproduce the experimental data within a factor of 2.4. Furthermore, we extend this improved model to predict proton radioactivity half-lives for possible proton candidates that are energetically allowed or observed but not yet quantified in the latest atomic mass excess NUBASE2020. Meanwhile, the universal decay law (UDL), the new Geiger-Nuttall law (N-GNL) and the phenomenological unified fission model (UFM) are also used for comparison. It is found that these predictions are generally consistent with each other.