Systematic Study Of Nucleus On Proton Radioactivity Half-life

Proton radioactivity is an important decay mode of proton-rich nuclei far from the?-stability line.The study of proton radioactivity obtain a lot of nuclear structure information for the nuclei lying close to the proton drip-line,and the study of its decay process can well promote the existing nuclear theory and models,and promote the development of more models.Analogous to the decay mechanism of?decay,proton radioactivity is also treated as a simple quantum tunneling phenomenon through a potential barrier.Therefore,based on Gamow's quantum tunneling theory,various models have been extended to the study of proton radioactivity.In this work,we systematically study the proton radioactivity half-lives,spectroscopic factor S_p,electrostatic barrier effect and predicate the proton radioactivity half-lives based on the proton radioactivity theories of two-potential approach,single-folding model,Gamow-like model and new Geiger-Nuttall law.This work includes the following four topics:(1)Based on the single folding model,we systematically study the half-lives of proton radioactivity for spherical nuclei,plot the total potential including the microscopic nuclear potential obtained by single folding the density of the daughter nucleus with the DDM3Y effective interaction,the realistic Coulomb potential obtained by single folding the charge density of the daughter nucleus with the proton-proton Coulomb interaction and the centrifugal potential.The calculated half-lives of proton-radioactivity nuclei can well reproduce the experimental data.(2)Based on the two-potential approach,we adopt a cosh-type nuclear potential,and give the corresponding nuclear potential parameters.we systematically study the half-lives of proton radioactivity for spherical nuclei,the calculated results can reproduce the experimental data within a factor of 2.04.The isospin effects are also compared.The results indicate that the effect of the isospin on the proton radioactive half-life is not obvious.In addition,the spectroscopic factor S_p is extracted through the ratio of the calculated result to the experimental data.(3)Based on the Gamow-like model,with the Hulthen potential for the electrostatic barrier effect being considered,we systematically study the half-lives of proton radioactivity for 69?Z?83 nuclei and show the differences caused by the electrostatic barrier effect through comparison.The calculations of proton radioactivity half-lives differ from the experiment data by a factor of 2.49.In addition,we extend this model to predict the proton radioactive half-life of 16 uncertain nuclei in the same region.(4)Based on Geiger-Nuttall-Brown systematics,considering the contributions of the daughter nuclear charge and the orbital angular momentum taken away by the emitted proton,we propose a two-parameter formula of new Geiger-Nuttall law for proton radioactivity.we extend this new Geiger-Nuttall law to predict the proton radioactivity half-lives for 51?Z?91 nuclei,whose proton radioactivity is energetically allowed or observed but not yet quantified in NUBASE2016.At last,a brief summary of this work and some outlooks are given.