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

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.