摘要
文章用Si(Li)漂移探测器测量了^137Cs的β衰变能谱和内转换电子能谱,对高能区β能谱进行了库里厄图处理,得到^137Cs发生两种β衰变,分别到达137Ba的基态3/2^+和激发态11/2^-的衰变分支比分别为(4.4±0.9)%和(95.6±0.9)%,该结果在统计误差的置信区间范围内。高能β射线的最大能量为(1022±274)keV,该结果同样在置信区间内,验证了本文采取的方法是正确的。由此绘制出^137Cs完整的衰变纲图,证明了测量β衰变能谱和内转换电子能谱的实验方法与理论基础的实用性。
The energy spectra of beta-decay and internal conversion electrons of ^137 Cs were measured by Si(Li) drift detector. The energy spectrum of beta-decay at high energy region was described by Kurie plot, and two kinds of beta-decays for ^137 Cs were obtained, which are respectively from the ground state of ^137 Cs to the ground state 3/2^+ and the excited state 11/2^- of 137 Ba, and respectively correspond to decay ratios of (4.4 ± 0.9)% and (95.6 ± 0.9)%. The results are in the region of confidence interval of statistic error. The maximum energy of high energy beta rays was (1022 ± 274) keV, which was in the region of confidence interval of statistic error, and also proves that the method is right. Therefore, the complete decay scheme of ^137 Cs was plotted, which indicates the practicability of the experimental and theoretical methods for measuring the decay energy spectrum and the internal conversion electron energy spectrum.
作者
李冉
张泽涛
秦雨浩
任赞
张高龙
LI Ran;ZHANG Zetao;QIN Yuhao;REN Zan;ZHANG Gaolong(School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191;Department of Engineering Physics,Tsinghua University,Beijing 100084)
出处
《物理与工程》
2019年第2期106-111,共6页
Physics and Engineering
