放射性核素寿命计算方法的模拟研究  

Simulation Study of Lifetime Calculation Methods for Radioactive Nuclides

作　　者：曾奇 王宁 王猛[3] 张玉虎[3] 涂小林[3] 徐星[3] 陈瑞九 陈相成 付超义 刘君豪 李宏福 司敏 帅鹏[3] 孙铭泽 邢元明[3] 颜鑫亮[3] 赵剑锟 周旭 周小红[3] ZENG Qi;WANG Ning;WANG Meng;ZHANG Yuhu;TU Xiaolin;XU Xing;CHEN Ruijiu;CHEN Xiangcheng;FU Chaoyi;LIU Junhao;LI Hongfu;SI Min;SHUAI Peng;SUN Mingze;XING Yuanming;YAN Xinliang;ZHAO Jiankun;ZHOU Xu;ZHOU Xiaohong(Engineering Research Center of Nuclear Technology Application,Ministry of Education,East China University of Technology,Nanchang 330013,China;School of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]东华理工大学核技术应用教育部工程研究中心,南昌330013 [2]东华理工大学核科学与工程学院,南昌330013 [3]中国科学院近代物理研究所,兰州730000 [4]中国科学院大学核科学与技术学院,北京100049

出　　处：《原子核物理评论》2020年第3期611-616,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11805032);核技术应用教育部工程研究中心开放基金资助项目(HJSJYB2017-1);江西省教育厅科学技术研究项目(GJJ170451)。

摘　　要：根据几种常用放射性核素的寿命计算方法,通过模拟数据研究了直接拟合法、对数时间法、极大似然法、观测时间受限时的极大似然法等四种寿命计算方法的适用范围。当观测时间不受限时,研究了在不同计数下寿命计算方法的适用范围。当观测时间受限时,研究了在不同观测时间窗口下寿命计算方法的适用范围。模拟中选用全剥离离子^(94m)Ru^(44+)作为目标核素,得到了不同计数及不同观测时间窗口下的寿命及其误差,并给出了四种方法的适用范围。^(94m)Ru^(44+)寿命的模拟结果与在兰州等时性质量谱仪上获得的实验结果在一倍标准偏差范围内一致,从而进一步验证了寿命计算方法的适用范围及模拟数据的可靠性。该模拟结果可为寿命测量实验设计提供理论依据和参考。According to several common lifetime calculation methods of radioactive nuclides,the scope of applicable of the four calculation methods,which are named Method of Direct Fitting,Method of Logarithmic Time,Method of Maximum Likelihood and Method of Maximum likelihood when observation time windows is limited,are studied based on the simulation data.As the observation time window is limited or not,the applicable range of the lifetime calculation methods in different observation time windows and different counts are discussed.In simulation,fully stripped ion ^(94m)Ru^(44+)was selected as the target nuclide,the lifetime and error in different counts and different observation time windows are obtained,and the applicable range of the four methods is given.The experimental data of ^(94m)Ru^(44+)was obtained from the lifetime measurement experiment which is performed by using the Isochronous Mass Spectrometry(IMS) at the HIRFL-CSR facility in Lanzhou.The simulation results are consistent with the experimental results within one error bar,thereby it is further verified the applicable range of the calculation method and the reliability of the simulation data.The simulation results provide theoretical basis and reference for the design of the future lifetime experiments.

关 键 词：兰州重离子加速器冷却储存环 等时性质量谱仪 全剥离离子 寿命模拟 94mRu 

分 类 号：O571.53[理学—粒子物理与原子核物理]