Empirical formula for β^--decay half-lives of r-process nuclei  

作　　者：Yong Zhou ZhiHong Li YouBao Wang YongShou Chen Bing Guo Jun Su YunJu Li ShengQuan Yan XinYue Li ZhiYu Han YangPing Shen Lin Gan Sheng Zeng Gang Lian WeiPing Liu 

机构地区：[1]China Institute of Atomic Energy

出　　处：《Science China(Physics,Mechanics & Astronomy)》2017年第8期21-27,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11490563 and 11375269);the National Basic Research Program of China(Grant No.2013CB834406);the National Key Research and Development Program of China(Grant No.2016YFA0400502)

摘　　要：Experimental data ofβ--decay half-lives of nuclei with atomic number between 20 and 190 are investigated.A systematic formula has been proposed to calculateβ^--decay half-lives of neutron-rich nuclei,with a particular consideration on shell and pair effects,the decay energy Q as well as the nucleon numbers(Z,N).Although the formula has relatively few parameters,it reproduces the experimentalβ^--decay half-lives of neutron-rich nuclei very well.The predicted half-lives for the r-process relevant nuclei obtained with the current formula serve as reliable input in the r-process model calculations.Experimental data of β--decay half-lives of nuclei with atomic number between 20 and 190 are investigated. A systematic formula has been proposed to calculateβ--decay half-lives of neutron-rich nuclei, with a particular consideration on shell and pair effects, the decay energy Q as well as the nucleon numbers （Z, N）. Although the formula has relatively few parameters, it reproduces the experimentalβ--decay half-lives of neutron-rich nuclei very well. The predicted half-lives for the r-process relevant nuclei obtained with the current formula serve as reliable input in the r-process model calculations.

关 键 词：β--decay half-lives neutron-rich nuclei R-PROCESS 

分 类 号：O571.3[理学—粒子物理与原子核物理] O571.2[理学—物理]