Study Of ? Decay And Proton Radioactivity Half-life

In 1896,Becquerel first observed the natural radiation of nuclei,and the discipline of nuclear physics was born.In the natural radiation phenomenon of atomic nuclei,? decay is an important tool for studying super-heavy nuclei,which can provide a wealth of information about the nuclear structure and stability of super-heavy nuclei.Studying proton radioactivity can extract important information about nuclear structures beyond the proton drip line,such as the shell structure.Therefore,studying ? decay and proton emission phenomena is of great significance to the research and development of nuclear physics.In this work,based on the Gamow-like model and electrostatic shielding,we study the effect of electrostatic shielding on the classical turning point,the half-life of ? decay and we also predict the half-life of seven even-even nuclei with Z=120 and some un-synthesized nuclei on their ? decay chains.In addition,the nuclear interaction potential was systematically studied by Skyrme-Hartree-Fock,the half-life of proton radioactivity was systematically studied by two-potential approach within Skyrme-Hartree-Fock and we also extend this model to predict proton emission half-lives of 13 nuclei,whose proton emission is energetically allowed or observed but not yet quantied.This work includes the following two topics:(1)The difference between considering the electrostatic shielding and not considering this effect for the nucleus is studied.Based on the Gamowlike model,we systematically studied the ? decays of 169 even-even nuclei,132 odd neutron-even proton nuclei,94 even neutron-odd proton nuclei,and 66 odd-odd nuclei half-lives.The improved Gamow-like model is used to predict the ? decay decay chain of even-even nuclei with proton numbers Z=120 and compared with Coulomb potential and Proximity potential model with proximity potential Bass73 formalism,the Viola-SeaborgSobiczewski empirical formula,the Universal curve,Royer formula,the Universal decay law,the Ni-Ren-Dong-Xu empirical formula.The results show that the electrostatic shielding is more pronounced for nuclei with a large number of protons and a small ? decay energy.And compared with the Gamow-like model,the improved Gamow-like model is in good agreement with the experimental data.At last,? decay half-life predicted using the improved Gamow-like model has a small deviation from known experimental data and is in the middle of all predictions.(2)The Skyrme-Hartree-Fock was used to calculate the nuclear potential in the proton radioactivity and compared with the standard WoodSaxon type nuclear potential.Based on two-potential approach within Skyrme-Hartree-Fock,we systematically studied the proton radioactive half-life of 53?Z?83 nuclei and compared with Coulomb potential and proximity potential model with Guo-2013 formalism,two-potential approach with folding potentials model within density-dependent M3 Y,and The Universal Decay law of proton emission.We also extend our model to predict proton emission half-lives of 13 nuclei,whose proton emission is energetically allowed or observed but not yet quantified.The results show that the calculated nuclear potential obtained by SkyrmeHartree-Fock is closer to the Wood-Saxon type nuclear potential.And compared with other models,the results calculated using our model are more consistent with the experimental data.Finally,a brief summary and outlook are given.