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

• Published in: Chinese physics C 2024-08, Vol.48 (8), p.84001
• Main Authors: Bai 白, Jiangbo 江博, Tang 唐, Jingyu 靖宇, Shi 施, Liqun 立群, Chen 陈, Yonghao 永浩, Yi 易, Han 晗, Bao 鲍, Jie 杰, Bao 鲍, Yu 煜, Cao 曹, Ping 平, Chen 陈, Haolei 昊磊, Chen 陈, Zhen 朕, Cui 崔, Zengqi 增琪, Fan 樊, Ruirui 瑞睿, Feng 封, Changqing 常青, Gao 高, Keqing 可庆, Gao 高, Xiaolong 晓龙, Gu 顾, MinHao 旻皓, Han 韩, Changcai 长材, He 贺, Guozhu 国珠, He 何, Yongcheng 泳成, Hong 洪, Yang 杨, Hu 胡, Yiwei 益伟, Huang 黄, Hanxiong 翰雄, Huang 黄, Xiru 锡汝, Jiang 江, Haoyu 浩雨, Jiang 蒋, Wei 伟, Jiang 姜, Zhijie 智杰, Jing 敬, Hantao 罕涛, Kang 康, Ling 玲, Li 李, Bo 波, Li 李, Chao 超, Li 李, Jiawen 嘉雯, Li 李, Qiang 强, Li 李, Xiao 晓, Li 李, Yang 样, Liu 刘, Jie 杰, Liu 刘, Shubin 树彬, Long 龙, Ze 泽, Luan 栾, Guangyuan 广源, Ning 宁, Changjun 常军, Niu 牛, Mengchen 梦臣, Qi 齐, Binbin 斌斌, Ren 任, Jie 杰, Ruan 阮, Xichao 锡超, Song 宋, Zhaohui 朝晖, Sun 孙, Kang 康, Sun 孙, Zhijia 志嘉, Tan 谭, Zhixin 志新, Tang 唐, Xinyi 新懿, Tian 田, Binbin 斌斌, Wang 王, Lijiao 丽娇, Wang 王, Pengcheng 鹏程, Wang 王, Zhaohui 朝辉, Wu 吴, Xiaoguang 晓光, Wu 吴, Xuan 煊, Xie 解, Likun 立坤, Yang 杨, Xiaoyun 晓云, Yu 于, Li 莉, Yu 余, Tao 滔, Yu 于, Yongji 永积, Zhang 张, Guohui 国辉, Zhang 张, Linhao 林浩, Zhang 张, Qiwei 奇玮, Zhang 张, Xianpeng 显鹏, Zhang 张, Yuliang 玉亮, Zhang 张, Zhiyong 志永, Zhou 周, Luping 路平, Zhou 周, Zhihao 志浩, Zhu 朱, Kejun 科军
• Format: Article
• Language: English
• ISSN: 1674-1137; 2058-6132
• DOI: 10.1088/1674-1137/ad4c5b

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.