Two-proton radioactivity within Coulomb and proximity potential model

Considering the preformation probability of the two emitted protons in the parent nucleus, we extend the Coulomb and proximity potential model (CPPM) to systematically study two-proton (2p) radioactivity half-lives of the nuclei close to proton drip line. The proximity potential chosen is Prox. 81 proposed by Blocki et al. in 1981. Furthermore, we apply this model to predict the half-lives of possible 2p radioactive candidates whose 2p radioactivity is energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2016. The predicted results are in good agreement with those from other theoretical models and empirical formulas, namely the effective liquid drop model (ELDM), generalized liquid drop model (GLDM), Gamow-like model, Sreeja formula and Liu formula.

Automated summary

In this study, we systematically investigate the two-proton (2p) radioactivity half-lives of nuclei near the proton drip line, considering the preformation probability of the emitted protons. We extend the Coulomb and proximity potential model (CPPM) and apply it to predict the half-lives of potential 2p radioactive candidates. The predicted results are in good agreement with those from other theoretical models and empirical formulas.