An improved simple model for α decay half-lives  

作　　者：朱小彦 骆松 高玮 亓林静 李明 李小华 林文斌 Xiao-Yan Zhu;Song Luo;Wei Gao;Lin-Jing Qi;Ming Li;Xiao-Hua Li;Wen-Bin Lin(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China;School of Mathematics and Physics,University of South China,Hengyang 421001,China;Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment,University of South China,Hengyang 421001,China;National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety,University of South China,Hengyang 421001,China)

机构地区：[1]School of Nuclear Science and Technology,University of South China,Hengyang 421001,China [2]School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China [3]School of Mathematics and Physics,University of South China,Hengyang 421001,China [4]Cooperative Innovation Center for Nuclear Fuel Cycle Technology&Equipment,University of South China,Hengyang 421001,China [5]National Exemplary Base for International Sci&Tech.Collaboration of Nuclear Energy and Nuclear Safety,University of South China,Hengyang 421001,China

出　　处：《Chinese Physics C》2024年第7期131-159,共29页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(12175100,11975132);the Construct Program of the Key Discipline in Hunan Province,the Research Foundation of Education Bureau of Hunan Province,China(22A0305,21B0402);the Natural Science Foundation of Hunan Province,China(2018JJ2321);the Innovation Group of Nuclear and Particle Physics in USC the Hunan Provincial Innovation Foundation for Postgraduate(CX20230962)。

摘　　要：In this paper,using theαparticle preformation probabilities Pαfrom Xu et al.[Xu and Ren,Nucl.Phys.A 760,303(2005)],which were extracted by fitting experimental half-lives ofαdecay,based on a phenomenological harmonic oscillator potential model(HOPM)[Bayrak,J Phys G 47,025102(2020)],refitting 178αdecay half-lives of even-even nuclei obtained from the latest nuclear property table NUBASE2020,we obtain the only one adjustable parameter V0-162.6 MeV in the HOPM,i.e.,the depth of nuclear potential.The corresponding root-mean-square(rms)deviation isσ-0.322.Furthermore,to consider the contribution of centrifugal potential to unfavoredαdecay half-lives,adding a new term■(d and l are the adjustable parameter and orbital angular momentum carried away by emittedαparticle)to the logarithmic form of favoredαdecay half-lives under the HOPM framework,we propose an improved simple model(ISM)for calculating favored and unfavoredαdecay half-lives.Fitting the experimental half-lives of 205 unfavoredαdecay,we obtain d-0.381.The ISM is used to calculate the unfavoredαdecay half-lives of 128 odd-A and 77 odd-odd nuclei.The results improve by 54.2%and 53.6%,respectively,compared with HOPM.In addition,we extend the ISM to predict theαdecay half-lives of 144 nuclei with Z=117,118,119,and 120.For comparison,the improved model with eight parameters(DUR)proposed by Deng et al.[Deng,Phys.Rev.C 101,034307(2020)]and the modified universal decay law(MUDL)proposed by Soylu et al.[Soylu,Nucl.Phys.A 1013,122221(2021)]are also used.The predictions of these models and/or formulas are generally consistent with each other.

关 键 词：harmonic oscillator potential αdecay HALF-LIVES centrifugal potential 

分 类 号：O571.321[理学—粒子物理与原子核物理]