Systematic study of theαdecay preformation factors of the nuclei around the Z=82,N=126 shell closures within the generalized liquid drop model  

作　　者：Hong-Ming Liu You-Tian Zou Xiao Pan Xiao-Jun Bao Xiao-Hua Li 刘宏铭;邹有甜;潘霄;包小军;李小华(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Hunan Normal University,Changsha 410081,China;Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment,University of South China,Hengyang 421001,China;Key Laboratory of Low Dimensional Quantum Structures and Quantum Control,Hunan Normal University,Changsha 410081,China)

机构地区：[1]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China [2]Hunan Normal University,Changsha 410081,China [3]Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment,University of South China,Hengyang 421001,China [4]Key Laboratory of Low Dimensional Quantum Structures and Quantum Control,Hunan Normal University,Changsha 410081,China

出　　处：《Chinese Physics C》2020年第9期130-141,共12页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(11205083,11505100,11705055);the Construct Program of the Key Discipline in Hunan Province,the Research Foundation of Education Bureau of Hunan Province,China(15A159,18A237);the Natural Science Foundation of Hunan Province,China(2015JJ3103,2015JJ2121,2018JJ3324);the Innovation Group of Nuclear and Particle Physics in USC,the Shandong Province Natural Science Foundation,China(ZR2015AQ007);the Hunan Provincial Innovation Foundation For Postgraduate(CX20190714,CX20200909);the National Innovation Training Foundation of China(201910555161);and the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment,University of South China(2019KFZ10)。

摘　　要：In this study,we systematically investigate theαdecay preformation factors,Pα,and theαdecay half-lives of 152 nuclei around Z=82,N=126 closed shells based on the generalized liquid drop model(GLDM)with Pαbeing extracted from the ratio of the calculatedαdecay half-life to the experimental one.The results show that there is a remarkable linear relationship between Pαand the product of valance protons(holes)Np and valance neutrons(holes)Nn.At the same time,we extract theαdecay preformation factor values of the even–even nuclei around the Z=82,N=126 closed shells from the study of Sun et al.[J.Phys.G:Nucl.Part.Phys.,45:075106(2018)],in which theαdecay was calculated by two different microscopic formulas.We find that theαdecay preformation factors are also related to NpNn.Combining with our previous studies[Sun et al.,Phys.Rev.C,94:024338(2016);Deng et al.,ibid.96:024318(2017);Deng et al.,ibid.97:044322(2018)]and that of Seif et al.,[Phys.Rev.C,84:064608(2011)],we suspect that this phenomenon of linear relationship for the nuclei around the above closed shells is model-independent.This may be caused by the effect of the valence protons(holes)and valence neutrons(holes)around the shell closures.Finally,using the formula obtained by fitting theαdecay preformation factor data calculated by the GLDM,we calculate theαdecay half-lives of these nuclei.The calculated results agree with the experimental data well.

关 键 词：αdecay αdecay preformation factor shell closure generalized liquid drop model 

分 类 号：O571.321[理学—粒子物理与原子核物理]