Two-proton radioactivity within Coulomb and proximity potential model

TL;DR

This paper extends the Coulomb and proximity potential model to systematically study two-proton radioactivity half-lives, predicting candidates and validating results against existing models with good agreement.

Contribution

The paper introduces an extended model incorporating preformation probability to predict two-proton radioactivity half-lives near the proton drip line.

Findings

Predicted half-lives align well with other theoretical models.

Identified potential two-proton radioactive candidates.

Extended model improves prediction accuracy.

Abstract

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.