Determination of the half-life of^(91)Sr in uranium sample bombarded by 14.8 MeV neutron  

作　　者：Yuting Wei Changlin Lan Li Feng Chao Xu Xianlin Yang Xiaojun Li Jiahao Wang Yujie Ge Benchao Lou Li Jiang 

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China [2]Institute of Nuclear Physics and Chemistry,Chinese Academy of Engineering Physics,Mianyang 621900,China

出　　处：《Radiation Detection Technology and Methods》2022年第3期361-366,共6页辐射探测技术与方法（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11975113).

摘　　要：Purpose Due to the few reports on the^(91)Sr half-life previously,the accuracy and uncertainty of the results are difficult to meet the requirements such as calculating the cross section and thefission yields of 235U,238U,and 239Pu.To solve the discrepancy of^(91)Sr half-life in existing experimental data,the half-life of^(91)Sr was measured in this work,and the uncertainty was discussed in detail.Method The measurements were performed by the activation method implemented for the uranium sample using the K-400 neutron generator at the Chinese Academy of Engineering Physics(CAEP).The half-life of^(91)Sr was measured byγ-ray spectrometry using the high-resolution High Purity Germanium(HPGe)Detector.Results Through exponential functionfitting and a detailed discussion of the uncertainty evaluation,the half-life of^(91)Sr in the present work was determined to be 9.65±0.30 h,which was consistent with the values reported previously and the uncertainty was reduced greatly,however,the uncertainty assessment of the latter was barely documented.Conclusions In this work,a more accurate measurement of the^(91)Sr half-life is provided,as well as the uncertainty is discussed in detail.This result will provide essential information for applications using an activation method,such as the calculation offission yields of 235U,238U,and 239Pu.

关 键 词：HALF-LIFE 91Sr γ-ray spectrometry UNCERTAINTY 

分 类 号：O57[理学—粒子物理与原子核物理]