Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS  

作　　者：Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie Bao Yu Bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie Liu Shubin Liu Ze Long Guangyuan Luan Changjun Ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu Xuan Wu Likun Xie Xiaoyun Yang Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Luping Zhou Zhihao Zhou Kejun Zhu 白江博;唐靖宇;施立群;陈永浩;易晗;鲍杰;鲍煜;曹平;陈昊磊;陈朕;崔增琪;樊瑞睿;封常青;高可庆;高晓龙;顾旻皓;韩长材;贺国珠;何泳成;洪杨;胡益伟;黄翰雄;黄锡汝;江浩雨;蒋伟;姜智杰;敬罕涛;康玲;李波;李超;李嘉雯;李强;李晓;李样;刘杰;刘树彬;龙泽;栾广源;宁常军;牛梦臣;齐斌斌;任杰;阮锡超;宋朝晖;孙康;孙志嘉;谭志新;唐新懿;田斌斌;王丽娇;王鹏程;王朝辉;吴晓光;吴煊;解立坤;杨晓云;于莉;余滔;于永积;张国辉;张林浩;张奇玮;张显鹏;张玉亮;张志永;周路平;周志浩;朱科军

机构地区：[1]Institute of Modern Physics,Fudan University,Shanghai 200433,China [2]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China [3]Sate Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China [4]Institute of High Energy Physics,Chinese Academy of Sciences(CAS),Beijing 100049,China [5]Spallation Neutron Source Science Center,Dongguan 523803,China [6]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China [7]Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China [8]State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China [9]State Key Laboratory of Particle Detection and Electronics,Institute of High Energy Physics Chinese Academy of Sciences,Beijing 100049,China [10]Northwest Institute of Nuclear Technology,Xi’an 710024,China [11]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics C》2024年第8期140-152,共13页中国物理C（英文版）

基　　金：Supported by the National Key Research and Development Plan(2016YFA0401603);the National Natural Science Foundation of China(11675155,11790321);Foundation of President of China Academy of Engineering Physics(YZJLX2016003)。

摘　　要：The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power installations.The neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 kW.The Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 keV.The neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy region.In the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,respectively.In the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,respectively.The results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 MeV.The total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 MeV.The results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关 键 词：^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber 

分 类 号：O571.53[理学—粒子物理与原子核物理]