HIRFL-CSR上全剥离同核异能态离子的寿命测量  

Decay Study for the Short-lived Isomer in Fully Stripped Ion Based on the HIRFL-CSR

作　　者：曾奇 李小燕 刘义保 张怀强 赵剑锟 李宏福 ZENG Qi;LI Xiaoyan;LIU Yibao;ZHANG Huaiqiang;ZHAO Jiankun;LI Hongfu(School of Nuclear Science and Engineering,East China University of Technology,Nanchang 330013,China;Jiangxi Engineering Technology Research Center of Nuclear Radiation Detection and Application,Nanchang 330013,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]东华理工大学核科学与工程学院,江西南昌330013 [2]江西省核辐射探测及应用工程技术研究中心,江西南昌330013 [3]中国科学院近代物理研究所,甘肃兰州730000

出　　处：《东华理工大学学报（自然科学版）》2024年第5期474-481,共8页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金项目(11805032,12275050,12305151);江西省自然科学基金项目(20224BAB211023);江西省高层次高技能领军人才培养工程项目(赣财社指〔2023〕37号)。

摘　　要：高电荷态离子的寿命数据被广泛应用于核物理及核天体物理等多个研究领域,在核废料处理等应用领域具有潜在应用价值。在兰州重离子加速器装置(HIRFL-CSR)上建立了一套基于等时性质量谱仪测量全剥离同核异能态离子寿命的实验方法。该实验方法在测量几十微秒到几百微秒时间尺度上发生的核衰变具有独特优势,尤其适用于开展全剥离同核异能态离子的衰变研究。飞行时间探测器记录离子的时间信号,通过这些时间信号可提取出每个离子的飞行时间信息并得到飞行时间与循环圈数的直线拟合残差。直线拟合残差就可以来鉴别衰变事件,基于衰变事件可得到全剥离同核异能态离子^(94)m Ru^(44+)的寿命。实验证明了基于储存环开展短寿命高电荷同核异能态离子衰变研究的可行性。The Half-life of highly charged ions(HCI)is widely used in many research fields such as nuclear physics and nuclear astrophysics,and has potential application value in nuclear waste processing and other application fields.At the cooler storage ring of the heavy ion research facility in Lanzhou(HIRFL-CSR),a set of experimental methods is established for measuring the lifetime of highly charged ions based on an isochronous mass spectrometry.This experimental method has unique advantages in measuring nuclear decay occurring on the time scale of tens to hundreds of microseconds.It is especially suitable for studying the decay of short-lived isomeric states in highly charged states.The time signals of ions were recorded using a time-of-flight detector.Through these time signals,the flight time of each ion could be extracted and the residuals of the linear fit between flight time and the number of revolutions could be obtained.The decay events could be distinguished based on these residuals.Based on the decay events,the lifetime of the fully stripped isomer^(94)m Ru^(44+)was determined.The experiment demonstrated the feasibility of studying decays of short-lived isomers in HCI using a storage ring.

关 键 词：兰州重离子加速器 等时性质量谱仪 全剥离离子 短寿命核素寿命 94m Ru 

分 类 号：O571[理学—粒子物理与原子核物理] TL594[理学—物理]