Determination of the half-life of^(184g)Re and the isomeric ratio of^(184m,g)Re induced by D-T neutrons  

作　　者：Changlin Lan Yuting Wei Jiahao Wang Xianlin Yang Gong Jiang Yujie Ge Chao Xu Li Feng Xiaojun Li 兰长林;魏玉婷;王家豪;杨宪林;姜功;葛裕杰;徐超;冯蠡;李小军(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China

出　　处：《Chinese Physics C》2022年第11期168-176,共9页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11975113)。

摘　　要：The isomeric ratio of^(184m,g)Re and the half-life of^(184g)Re were measured in the ^(185)Re(n,2n)^(184)Re reaction at 14.8 MeV,and the uncertainty was discussed in detail.The measurements were performed using the activation method implemented for a rhenium sample using the K-400 neutron generator at the Chinese Academy of Engineering Physics(CAEP).Isomeric state and ground state nuclei of ^(184)Re were identified by their γ-ray spectra.To eliminate the effect of the γ-ray emitted from the isomer on the counting of the ground state characteristic peaks,the isomeric ratio of^(184m,g)Re was calculated to be 0.29±0.11 according to the neutron activation cross-section formula.This result is consistent with previous data within the uncertainty and can be used to determine parameters that characterize the dependence of the level density on the excitation energy and angular momentum.Through exponential function fitting and a detailed discussion of the uncertainty evaluation,the half-life of^(184g)Re was determined as 35.43±0.16 d,which is consistent with the currently recommended value;however,the uncertainty assessment of the latter was barely documented.In addition,this study indicates that the half-life of the ground state can be obtained by eliminating the contamination of γ-rays emitted from the isomer,which provides the possibility of determining the half-lives of nuclides containing isomers.

关 键 词：HALF-LIFE ^(184)Re γ-ray spectrometry isomeric ratio 

分 类 号：O571.3[理学—粒子物理与原子核物理] TG146.418[理学—物理]