基于白光中子源的^(197)Au中子辐射俘获截面测量及共振参数分析  

Neutron capture reaction cross-section data processing and resonance parameter analysis of^(197)Au based on white light neutron source

作　　者：罗淏天 张奇玮[1] 栾广源 王晓宇 邹翀 任杰[1] 阮锡超[1] 贺国珠[1] 鲍杰[1] 孙琪 黄翰雄[1] 王朝辉[1] 吴鸿毅 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 赵豫斌 周路平 周祖英 朱丹阳[4,5] 朱科军 朱鹏[2,3] 朱兴华[12] Luo Hao-Tian;Zhang Qi-Wei;Luan Guang-Yuan;Wang Xiao-Yu;Zou Chong;Ren Jie;Ruan Xi-Chao;He Guo-Zhu;Bao Jie;Sun Qi;Huang Han-Xiong;Wang Zhao-Hui;Wu Hong-Yi;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,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;State Key Laboratory of Particle Detection and Electronics,Beijing 100049,China;State Key Laboratory of Particle Detection and Electronics,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

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,核探测与核电子学国家重点实验室,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》2024年第7期104-113,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11975317,11975318,12275363);核数据重点实验室基金(批准号:JCKY2022201C158);稳定支持基础科研计划(批准号:BJ010261223282)资助的课题。

摘　　要：中子辐射俘获反应在反应堆运行、核装置设计及核天体物理研究中起重要的作用.4πBaF_(2)探测装置有着高时间分辨能力、低中子灵敏度、高探测效率等优点,适合开展中子辐射俘获反应截面数据的测量.中国原子能科学研究院核数据重点实验室建立了伽马全吸收装置(Gamma total absorption facility,GTAF),该装置用28块六棱BaF_(2)晶体和12块五棱BaF_(2)晶体构成了外径25 cm,内径10 cm的球壳,覆盖了95.2%的立体角.利用GTAF在中国散裂中子源Back-n束线上,测量了197Au(n,γ)的反应截面数据.测量数据通过能量筛选、PSD方法、晶体多重性筛选进行了初步本底扣除,随后结合对^(nat)C及空样品的测量数据对本底进行了分析及扣除,获得了197Au俘获反应的产额,利用SAMMY程序拟合得到了^(197)Au在1—100 e V的共振能量、中子共振宽度和伽马共振宽度参数.实验测量结果与ENDF/B-VIII.0数据库符合良好,其共振参数存在一定差异,分析原因可能与GTAF能量分辨率、Back-n的中子能谱测量精度、以及实验本底扣除方法相关,这也是下一步工作的重点.Neutron capture reaction is one of the neutron reactions and plays an important role in using reactor control rods and shell materials,designing nuclear device structures,and studying nuclear astrophysics S processes and element origins.The 4πBaF2 detection device has advantages such as high time resolution,low neutron sensitivity,and high detection efficiency,thus making it suitable for measuring neutron radiation capture reaction cross-section data.In order to fill the gap in our neutron capture reaction data in the keV energy range and improve their accuracy,the Key Laboratory of Nuclear Data at the Chinese Institute of Atomic Energy(CIAE)has established a Gamma Total Absorption Facility(GTAF),which consists of 28 hexagonal BaF2 crystals and 12 pentagonal BaF2 crystals to form a spherical shell with an external diameter of 25 cm and an internal diameter of 10 cm,covering 95.2%of the solid angles.The Back-n beam line of the Chinese Spallation Neutron Source(CSNS)is a back-streaming white beam line that covers neutron energy ranging from a few eV to several hundred MeV,making it suitable for measuring neutron capture cross-sections.The reaction cross-section data of^(197)Au is measured by using GTAF on the Back-n beam line.The measurement data are preliminarily background deducted through energy screening,PSD method,and crystal multiplicity screening.Subsequently,the background is analyzed and deducted based on the measurement data of natC and empty samples,and the yield of^(197)Au capture reaction is obtained.Resonance parameters are a set of parameters extracted from experimental data to describe the resonance curve,which can eliminate the influence of experimental conditions on resonance data and are more important than the cross-section obtained from experiments.The resonance energy,neutron resonance width,and gamma resonance width parameters of 197 Au at 1–100 eV are fitted by using the SAMMY program.From the comparison between the resonance curves obtained from experimental measurements and the resonanc

关 键 词：中子辐射俘获截面 共振参数 白光中子源 伽马全吸收装置 

分 类 号：O571.5[理学—粒子物理与原子核物理]