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Measurement of the Neutron Total Cross Section of 9be at the Back-n White Neutron Source of CSNS

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

CHINESE PHYSICS C(2024)

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摘要
The neutron total cross section data of Be-9 are essential in the nuclear structure model research of light nuclei and nuclear power installations. The neutron total cross section of Be-9 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 U-235 and U-238 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 Be-9 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 U-235 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.
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关键词
Be-9 neutron total cross section,CSNS Back-n,time-of-flight method,transmission method,multi-cell fast fission chamber
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