基于CSNS反角白光中子源的中子俘获反应截面测量技术研究  

Cross section measurement of neutron capture reaction based on back-streaming white neutron source at China spallation neutron source

作　　者：张奇玮[1] 栾广源 任杰[1] 阮锡超[1] 贺国珠[1] 鲍杰[1] 孙琪 黄翰雄[1] 王朝辉[1] 顾旻皓[2,4] 余滔 解立坤 陈永浩 安琪 白怀勇 鲍煜[2,3] 曹平 陈昊磊 陈琪萍 陈裕凯[2,3] 陈朕 崔增琪[6] 樊瑞睿 封常青 高可庆 韩长材[8] 韩子杰 何泳成 洪杨[2,3,9] 黄蔚玲 黄锡汝 季筱璐[2,4] 吉旭阳[4,10] 蒋伟 江浩雨 姜智杰[4,5] 敬罕涛 康玲 康明涛[2,3] 李波 李超 李嘉雯 李论 李强 李晓[2,3] 李样 刘荣[7] 刘树彬 刘星言[7] 穆奇丽 宁常军[2,3] 齐斌斌 任智洲 宋英鹏[2,3] 宋朝晖 孙虹 孙康[2,3,9] 孙晓阳 孙志嘉[2,3,4] 谭志新 唐洪庆 唐靖宇[2,3] 唐新懿 田斌斌[2,3] 王丽娇 王鹏程 王琦 王涛峰 文杰 温中伟 吴青彪 吴晓光[1] 吴煊 羊奕伟 易晗 于莉[2,3] 于永积 张国辉[6] 张林浩 张显鹏[8] 张玉亮[2,3] 张志永[4,5] 赵豫斌[2,3] 周路平[2,3,9] 周祖英[1] 朱丹阳[4,5] 朱科军[2,4,9] 朱鹏[2,3] 朱兴华[12] Zhang Qi-Wei;Luan Guang-Yuan;Ren Jie;Ruan Xi-Chao;He Guo-Zhu;Bao Jie;Sun Qi;Huang Han-Xiong;Wang Zhao-Hui;Gu Min-Hao;Yu Tao;Xie Li-Kun;Chen Yong-Hao;An Qi;Bai Huai-Yong;Bao Yu;Cao Ping;Chen Hao-Lei;Chen Qi-Ping;Chen Yu-Kai;Chen Zhen;Cui Zeng-Qi;Fan Rui-Rui;Feng Chang-Qing;Gao Ke-Qing;Han Chang-Cai;Han Zi-Jie;He Yong-Cheng;Hong Yang;Huang Wei-Ling;Huang Xi-Ru;Ji Xiao-Lu;Ji Xu-Yang;Jiang Wei;Jiang Hao-Yu;Jiang Zhi-Jie;Jing Han-Tao;Kang Ling;Kang Ming-Tao;Li Bo;Li Chao;Li Jia-Wen;Li Lun;Li Qiang;Li Xiao;Li Yang;Liu Rong;Liu Shu-Bin;Liu Xing-Yan;Mu Qi-Li;Ning Chang-Jun;Qi Bin-Bin;Ren Zhi-Zhou;Song Ying-Peng;Song Zhao-Hui;Sun Hong;Sun Kang;Sun Xiao-Yang;Sun Zhi-Jia;Tan Zhi-Xin;Tang Hong-Qing;Tang Jing-Yu;Tang Xin-Yi;Tian Bin-Bin;Wang Li-Jiao;Wang Peng-Cheng;Wang Qi;Wang Tao-Feng;Wen Jie;Wen Zhong-Wei;Wu Qing-Biao;Wu Xiao-Guang;Wu Xuan;Yang Yi-Wei;Yi Han;Yu Li;Yu Yong-Ji;Zhang Guo-Hui;Zhang Lin-Hao;Zhang Xian-Peng;Zhang Yu-Liang;Zhang Zhi-Yong;Zhao Yu-Bin;Zhou Lu-Ping;Zhou Zu-Ying;Zhu Dan-Yang;Zhu Ke-Jun;Zhu Peng;Zhu Xing-Hua(Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China;Institute of High Energy Physics,Chinese Academy of Sciences(CAS),Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;State Key Laboratory of Particle Detection and Electronics,Beijing 100049,Hefei 230026,China;Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China;Northwest Institute of Nuclear Technology,Xi’an 710024,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Engineering and Applied Physics,University of Science and Technology of China,Hefei 230026,China;School of Physics,Beihang University,Beijing 100083,China;Huaneng Shandong Shidao Bay Nuclear Power Co.Ltd,Rongcheng 264312,China)

机构地区：[1]中国原子能科学研究院核数据重点实验室,北京102413 [2]中国科学院高能物理研究所,北京100049 [3]散裂中子源科学中心,东莞523803 [4]核探测与核电子学国家重点实验室,北京100049 [5]中国科学技术大学近代物理系,合肥230026 [6]北京大学物理学院,核物理与核技术国家重点实验室,北京100871 [7]中国工程物理研究院核物理与化学研究所,绵阳621900 [8]西北核技术研究院,西安710024 [9]中国科学院大学,北京100049 [10]中国科学技术大学工程与应用物理系,合肥230026 [11]北京航空航天大学物理学院,北京100083 [12]华能山东石岛湾核电有限公司,荣成264312

出　　处：《物理学报》2021年第22期28-39,共12页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11605294,11675268,11790321,11975317);国家重点研发计划(批准号:2016YFA0401601)资助的课题.

摘　　要：中子俘获反应截面数据在核天体物理研究、先进核能开发中具有非常重要的应用,由于缺乏合适的白光中子源和探测装置,国内在keV能区(1 eV-100 keV)中子俘获反应截面的实验数据几乎是空白.中国原子能科学研究院核数据重点实验室建造了国内第一台γ全吸收型探测装置,由40块BaF_(2)探测器单元组成厚度为15 cm,内半径为10 cm的BaF_(2)晶体球壳,共覆盖了95.2%的立体角.利用升级后的装置在中国散裂中子源的反角白光中子源上建立了中子俘获反应截面在线测量技术.在不规则的φ30 mm中子束斑的实验条件下,完成首次197Au中子俘获反应截面的在线测量,利用加和能谱和多重数分布扣除本底,反演飞行时间谱得到keV能区197Au中子俘获反应截面的实验数据.通过与ENDF评价数据库相关数据的比较,共振峰位置能够很好地吻合,从而验证了测量装置和测量技术的可靠性,为下一步高精度截面数据的获取奠定基础.The data of neutron capture cross section are very important for the research of nuclear astrophysics,advanced nuclear energy development.Owing to the limitation of neutron source and detector,the experimental data of neutron capture cross section in an energy range of 1 eV–10 keV were almost blank in China.The first Chinese gamma-ray total absorption facility has been constructed in the key laboratory of nuclear data at China institute of atomic energy,which consists of 40 BaF_(2)detector units.The BaF_(2)crystal shell with a thickness of 15 cm and an inner radius of 10 cm covers 95.2%of the solid angle.On-line measurement method of neutron capture reaction cross section is established on the back-streaming white neutron source of China spallation neutron source by using the upgraded facility.The cross section of ^(197)Au neutron capture reaction is measured for the first time under the experimental condition of irregular 30 mm neutron beam spot.The measured position of resonance peak is well consistent with the relevant data of ENDF evaluation database,which verifies the reliability of the measurement device and measurement technology,and thus laying the foundation for the acquisition of high precision cross section in future.

关 键 词：γ全吸收型探测装置 中子俘获反应截面 中国散裂中子源 白光中子源 

分 类 号：O571.5[理学—粒子物理与原子核物理]