r-过程路径核β^--衰变半衰期的估算  

Estimate of β^--decay Half-lives for r-process Nuclei

作　　者：周勇[1] 李志宏[1] 陈永寿[1] 王友宝[1] 苏俊[1] 郭冰[1] 柳卫平[1] 

机构地区：[1]中国原子能科学研究院,北京1024131

出　　处：《原子核物理评论》2017年第3期425-430,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11321064)~~

摘　　要：分析了20<A<190范围内丰中子核β衰变的实验数据,根据半衰期随质子数、中子数以及衰变能变化所呈现的壳效应和对效应等特点,提出了一种有效估算丰中子核β衰变寿命的公式。新的计算公式形式简单包含了较少的参数、计算量小。用该公式能较为准确地再现丰中子核的β衰变半衰期。用RIKEN最新测量丰中子核半衰期检验了该公式的外推能力,本工作可以为r-过程研究提供可靠的输入数据。Experimental data of the β--decay half-lives for the nuclei with atomic number between 20 and190 are investigated. We have systematically studied the shell effects and pairing effects on β--decay half-lives versus the decay energy Q and nucleon numbers（Z, N）. An empirical formula has been proposed to calculate the β--decay half-lives of neutron-rich nuclei. The empirical formula is simple and has relatively few parameters.Experimental β--decay half-lives of the neutron-rich nuclei are well reproduced by the new formula. In addition,the extrapolating capacity of this formula has been checked with the very recent experimental data from RIKEN.The predicted half-lives for r-process relevant nuclei with the current formula can be served as the reliable input of r-process model calculations.

关 键 词：β衰变寿命 丰中子核 r-过程 壳效应 对效应 

分 类 号：O571.22[理学—粒子物理与原子核物理]