^(151)Eu中子俘获截面中^(152)Eu同质异能态贡献的模型检验和分析  

Model calculation and analysis of ^(151)Eu neutron capture cross section contributed by isomeric state of ^(152)Eu

作　　者：薛韩 马余刚[1] 王宏伟[1] 曹喜光[1] 安振东[1,4] 范功涛 刘龙祥[1] 浮海娟[1,5] 张岳 胡新荣 XUE Han;MA Yugang;WANG Hongwei;CAO Xiguang;AN Zhendong;FAN Gongtao;LIU Longxiang;FU Haijuan;ZHANG Yue;HU Xinrong(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;ShanghaiTech University,Shanghai 201210,China;School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200044,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210 [4]中山大学物理与天文学院,珠海519082 [5]上海大学材料科学与工程学院,上海200044

出　　处：《核技术》2018年第11期49-54,共6页Nuclear Techniques

基　　金：国家自然科学基金(No.11475245);国家自然科学基金创新研究群体(No.11421505);上海光源线站工程(No.1173SRCZ01);中国科学院战略性先导科技专项B(No.XDB160203)资助~~

摘　　要：^(151)Eu中子俘获截面在反应堆物理以及核天体物理慢中子俘获过程中具有重要的作用,由于^(152)Eu两个同质异能态(m1, 0-; m2, 8-)的贡献,使得生成^(152)Eu基态和同质异能态的中子俘获截面的测量和区分难度增大。利用核反应理论模型程序—TALYS-1.8,计算了中子能量在0.01~20 MeV区间的^(151)Eu(n,γ)^(152)Eu基态和同质异能态的中子俘获反应截面,并与EXFOR截面数据库中已有的实验数据进行比较,检验了现有^(151)Eu实验数据的可靠性。分析表明:由于^(152)Eu基态和第一同质异能态都存在121.8 keV能级的退激,使得它们的截面测量存在较大误差,而基态和第二同质异能态的截面理论值基本与实验值相一致。[Background] The ^151Eu neutron capture cross-section plays an important role in reactor physics and in the slow neutron capture of nuclear astrophysics. [Purpose] This study aims to distinguish two isomers of ^152Eu and measure neutron capture cross-section of ^151Eu. [Methods] The ^151Eu（n,γ）^152Eu reaction cross-sections at the neutron energies from 0.01 MeV to 20 MeV were calculated by using software TALYS- 1.8 which is a mature computer code for simulating nuclear reactions in present work. The accuracy of simulation calculation program was verified and compared the theoretical data with the existing experimental data from EXFOR cross-section database and the latest neutron activation cross-section data. [Results ＆ Conclusions] The results show that there is a large error in the cross-section measurement of the ground state and the first isomeric state due to the interference of the 121.78 keV energy level, whereas the theoretical values of the ground state and the second isomeric state are basically consistent with the existing experimental values.

关 键 词：TALYS 1.8 ^151Eu(n γ)^152Eu反应 反应截面 

分 类 号：O571.1[理学—粒子物理与原子核物理]