电子密度变化对^(56)Mn半衰期的影响  

The influence of the change of electron density on the half-life of^(56)Mn

作　　者：孙慧斌[1] 钟健[1] 刘嘉健[1] 罗奇[1] 胡世鹏[1] 

机构地区：[1]深圳大学物理科学与技术学院,深圳518060

出　　处：《深圳大学学报（理工版）》2014年第2期124-129,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(10775098);深圳市高纯锗制造重点实验室基金资助项目~~

摘　　要：利用微型中子源反应堆辐照55Mn样品,得到放射性核素56Mn,使用高纯锗探测系统测量56Mn的能谱,得到56Mn在不同化合态下的半衰期并进行比较.通过β衰变的费米理论,引入约化电荷计算,对不同化合态下56Mn的衰变常数与约化电荷进行比对研究.利用同核异能移概念,分析原子价电子的交换和电子云的重叠对56Mn衰变常数的影响,说明56Mn半衰期会因为电子密度不同而改变.The radioactive isotope 56 Mn （ manganese 56 ） was produced by activating the 55 Mn samples in the minia-ture neutron source reactor in Shenzhen University. The energy spectrum of 56 Mn was detected by the high purity ger-manium detector system （ HPGe system） . The half-life of 56 Mn in different chemical environments was studied and compared. The reduced charge was calculated by using the Fermi beta-decay theory,then compared with the change of decay constant of 56 Mn in different chemical environments. The impact of the valence electron exchange and elec-tron cloud overlap to the decay constant of the 56 Mn was analyzed using the theory of the concept of isomer shift. The result is that the half-life of 56 Mn is changed due to the variances of electron density.

关 键 词：核能谱学 衰变常数 半衰期 化学环境 电子密度 约化电荷 同核异能移 NUCLIDE MANGANESE 56 

分 类 号：O571.2[理学—粒子物理与原子核物理]