0.57 MeV、1.0 MeV和1.5 MeV单能中子诱发235U裂变的产物产额绝对测量  

Absolutely Measurement of Product Yields From 0.57 MeV,1.0 MeV and 1.5 MeV Neutron Induced Fission of 235U

作　　者：任四禧 冯晶[2] 杨毅[2] 刘世龙[2] 鲍杰[2] 丁有钱[3] 邱奕嘉 兰长林[4] 刘应都 REN Si-xi;FENG Jing;YANG Yi;LIU Shi-long;BAO Jie;DING You-qian;QIU Yi-jia;LAN Chang-lin;LIU Ying-du(School of Materials Science and Engineering,Xiangtan University,Xiangtan 411105,China;China Institute of Atomic Energy,P.O.Box 275(46),Beijing 102413,China;China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413,China;School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]湘潭大学材料科学与工程学院,湖南湘潭411105 [2]中国原子能科学研究院核物理研究所,北京102413 [3]中国原子能科学研究院放射化学研究所,北京102413 [4]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《核化学与放射化学》2023年第3期216-223,I0002,共9页Journal of Nuclear and Radiochemistry

基　　金：核数据重点实验室基金资助项目(JCKY2019201C151)。

摘　　要：235U的裂变产物产额是核能应用和核物理研究中的重要基础数据。本工作应用高纯锗γ能谱法绝对测量了0.57、1.0 MeV和1.5 MeV中子诱发235U裂变的各能量点30个质量链的产额数据。样品的裂变率通过双裂变室监测,并利用蒙特卡罗(MCNP)模拟了辐照时样品的中子能谱,结果与国际上相应能量点数据在实验不确定度范围内吻合。本工作得到的产额数据澄清了原有数据最高16%的差异并将数据精度从国际上原有数据精度5%~7%提高到3%~5%。Fission product yields are fundamental nuclear data for nuclear energy applications and nuclear physics research.In this work,HPGeγspectrometric technique is applied to absolutely measure the mass distributions from 0.57,1.0 MeV and 1.5 MeV neutron induced fission of 235 U,and more than 30 mass chain yields are obtained for each energy.The fission rate of uranium sample is monitored by a double fission chamber and its neutron spectrum is simulated via MCNP program.Comparing with the existing data of other lab,our results are in good agreement within the experimental uncertainties.The output data obtained in this work clarifies the difference of up to 16%in the original data and improves the data accuracy from 5%-7%of the original international data to 3%-5%.

关 键 词：裂变产额 235U Γ能谱法 

分 类 号：TL816[核科学技术—核技术及应用]