基于两势方法系统研究壳结构对原子核α衰变的影响  

Systematic Study of the Shell Effect on α Decay within Two–potential Approach

作　　者：陈玖龙 程俊皓 邓军刚 李小华[1] CHEN Jiulong;CHENG Junhao;DENG Jungang;LI Xiaohua(School of Nuclear Science and Technology,University of South China,Hengyang 421001,Hunan,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001

出　　处：《原子核物理评论》2018年第4期470-474,共5页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11205083);湖南省自然科学基金资助项目(2015JJ3103;2015JJ2121);湖南省教育厅重点项目(15A159);南华大学研究生科学基金项目(2018KYY027)~~

摘　　要：基于两势方法(two–potential–approach,TPA)系统研究了偶-偶核、奇-A核和奇-奇核α衰变半衰期。为了考虑原子核的壳结构的影响而导致的实验半衰期与计算结果之间的偏差,引入了与α结团形成概率相关的禁戒因子和预形成因子。结合前期相关工作[X. D. Sun et al., Phys. Rev. C 93, 034316 (2016); X. D. Sun et al., Phys. Rev. C 95, 014319 (2017);X. D. Sun et al., Phys. Rev. C 95, 044303 (2017)],考虑到壳效应对α粒子预形成的影响,通过分析α衰变半衰期的实验数据,拟合得到了α粒子预形成因子/禁戒因子修正公式的参数,得到了α衰变预形成因子/禁戒因子的计算结果,证实了壳效应及质子-中子相互作用在α结团形成过程中起着重要的作用,离壳越近预形成概率越小离壳越远预形成概率越大。In the present work, the α decay half–lives are systematically studied within the two-potentialapproach for even-even nuclei, odd-A nuclei and odd–odd nuclei. To describe the deviations between experimental half-lives and calculated results due to the nuclear shell structure, α preformation factor and hindrance factor related with α cluster preformation probability are introduced. It is consistent with our previous works [X. D.Sun et al., Phys. Rev. C 93, 034316(2016);X. D. Sun et al., Phys. Rev. C 95, 014319(2017);X. D. Sun et al., Phys. Rev. C 95, 044303(2017)]. Considering the shell effect on the preformation of α and by analyzing the experimental data of the α decay half-lives, the parameters of the α preformation factor/hindrance factor correction formula are obtained. we confirm that the shell effect and the proton-neutron correlation play key roles in the α preformation where the preformation probability near the shell is less than the preformation probability far from the shell.

关 键 词：Α衰变 两势方法 α衰变预形成因子 禁戒因子 壳效应 

分 类 号：O571.321[理学—粒子物理与原子核物理]