New Geiger-Nuttall law for two-proton radioactivity

In the present work,a two-parameter empirical formula is proposed,based on the Geiger-Nuttall law,to study two-proton( 2p )radioactivity.Using this formula,the calculated 2p radioactivity half-lives are in good agreement with the experimental data as well as with calculated results obtained by Goncalves et al.[Phys.Lett.B 774,14(2017)]using the effective liquid drop model(ELDM),Sreeja et al.[Eur.Phys.J.A 55,33(2019)]using a four-parameter empirical formula,and Cui et al.[Phys.Rev.C 101:014301(2020)]using a generalized liquid drop model(GLDM).In addition,this two-parameter empirical formula is extended to predict the half-lives of 22 possible 2p radioactivity candidates with 2p radioactivity released energy Q_2p>0 ,obtained from the latest evaluated atomic mass table AME2016.The predicted results are highly consistent with those obtained using other theoretical models such as the ELDM,GLDM and four-parameter empirical formula.     

Systematic study of two-proton radioactivity within a Gamow-like model

In this study,based on the Gamow-like model,we systematically analyze two-proton(2p) radioactivity half-lives of nuclei near or beyond the proton drip line.It is found that the calculated results can reproduce experimental data well.Furthermore,using this model,we predict the half-lives of possible 2p radioactivity candidates whose 2p radioactivity is energetically allowed or observed but not yet quantified in the latest table of evaluated nuclear properties,i.e.,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),Sreej a formula,and Liu formula.