Experimental result of back-streaming white neutron beam characterization at Chinese spallation neutron source
Authors: Bao Jie , Chen Yong-Hao , Zhang Xian-Peng , Luan Guang-Yuan , Ren Jie , Wang Qi , Ruan Xi-Chao , Zhang Kai , An Qi , Bai Huai-Yong , Cao Ping , Chen Qi-Ping , Cheng Pin-Jing , Cui Zeng-Qi , Fan Rui-Rui , Feng Chang-Qing , Gu Min-Hao , Guo Feng-Qin , Han Chang-Cai , Han Zi-Jie , He Guo-Zhu , He Yong-Cheng , He Yue-Feng , Huang Han-Xiong , Huang Wei-Ling , Huang Xi-Ru , Ji Xiao-Lu , Ji Xu-Yang , Jiang Hao-Yu , Jiang Wei , Jing Han-Tao , Kang Ling , Kang Ming-Tao , Lan Chang-Lin , Li Bo , Li Lun , Li Qiang , Li Xiao , Li Yang , Li Yang , Liu Rong , Liu Shu-Bin , Liu Xing-Yan , Ma Ying-Lin , Ning Chang-Jun , Nie Yang-Bo , Qi Bin-Bin , Song Zhao-Hui , Sun Hong , Sun Xiao-Yang , Sun Zhi-Jia , Tan Zhi-Xin , Tang Hong-Qing , Tang Jing-Yu , Wang Peng-Cheng , Wang Tao-Feng , Wang Yan-Feng , Wang Zhao-Hui , Wang Zheng , Wen Jie , Wen Zhong-Wei , Wu Qing-Biao , Wu Xiao-Guang , Wu Xuan , Xie Li-Kun , Yang Yi-Wei , Yang Yi , Yi Han , Yu Li , Yu Tao , Yu Yong-Ji , Zhang Guo-Hui , Zhang Jing , Zhang Lin-Hao , Zhang Li-Ying , Zhang Qing-Min , Zhang Qi-Wei , Zhang Yu-Liang , Zhang Zhi-Yong , Zhao Ying-Tan , Zhou Liang , Zhou Zu-Ying , Zhu Dan-Yang , Zhu Ke-Jun , Zhu Peng ,   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,   Dongguan Neutron Science Center, Dongguan 523803, China,   Northwest Institute of Nuclear Technology, Xi’an 710024, China,   State Key Laboratory of Particle Detection and Electronic, 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,   University of South China, Hengyang 421001, China,   Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China,   Xi’an Jiaotong University, Xi’an 710049, China,   Beihang University, Beijing 100083, China,   School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
Published: December 2020

The Chinese spallation neutron source was completed in May 2018 and then subsequently commissioned. The Back-streaming white neutron beam line can be used in neutron nuclear data measurement, neutron physics research, and nuclear technology. In these experiments, it is necessary to know the neutron energy spectrum, the neutron flux, and the neutron beam profile of the neutron beam. In this paper, we present the preliminary measurements of these parameters. The neutron energy spectrum and neutron flux are measured by the time-of-flight method with a fission chamber equipped with <sup>235</sup>U and <sup>238</sup>U samples and a <sup>6</sup>Li-Si detector. The neutron beam profile is measured by a scintillator-CMOS detection system. The preliminary experimental measurements of the beam line are obtained. Among them, the energy spectrum measurement range of white neutrons is from eV to more than 100 MeV, which also gives an uncertainty analysis; the neutron fluence rate gives the full power value of the two experimental halls; the collimated white neutron beam spot is given under a diameter of 60 mm. The future plan is also given. The results of these experimental parameters can serve as the foundation for the future nuclear data measurement and detector calibration experiments of the beam line.