EPJ Web of Conferences (Jan 2020)

Measurement of the neutron energy spectrum of Back-n #ES1 at CSNS

  • Chen Yonghao,
  • Luan Guangyuan,
  • Bao Jie,
  • Jing Hantao,
  • An Qi,
  • Bai Huaiyong,
  • Cao Ping,
  • Chen Qiping,
  • Cheng Pinjing,
  • Cui Zengqi,
  • Fan Ruirui,
  • Feng Changqing,
  • Gu Minhao,
  • Guo Fengqin,
  • Han Changcai,
  • Han Zijie,
  • He Guozhu,
  • He Yongcheng,
  • He Yuefeng,
  • Huang Hanxiong,
  • Huang Weiling,
  • Huang Xiru,
  • Ji Xiaolu,
  • Ji Xuyang,
  • Jiang Haoyu,
  • Jiang Wei,
  • Kang Ling,
  • Kang Mingtao,
  • Li Bo,
  • Li Lun,
  • Li Qiang,
  • Li Xiao,
  • Li Yang(a),
  • Li Yang(b),
  • Liu Rong,
  • Liu Shubin,
  • Liu Xingyan,
  • Ma Yinglin,
  • Ning Changjun,
  • Qi Binbin,
  • Ren Jie,
  • Ruan Xichao,
  • Song Zhaohui,
  • Sun Hong,
  • Sun Xiaoyang,
  • Sun Zhijia,
  • Tan Zhixin,
  • Tang Hongqing,
  • Tang Jingyu,
  • Wang Pengcheng,
  • Wang Qi,
  • Wang Taofeng,
  • Wang Yanfeng,
  • Wang Zhaohui,
  • Wang Zheng,
  • Wen Jie,
  • Wen Zhongwei,
  • Wu Qingbiao,
  • Wu Xiaoguang,
  • Wu Xuan,
  • Xie Likun,
  • Yang Yiwei,
  • Yi Han,
  • Yu Li,
  • Yu Tao,
  • Yu Yongji,
  • Zhang Guohui,
  • Zhang Jing,
  • Zhang Linhao,
  • Zhang Liying,
  • Zhang Qingming,
  • Zhang Qiwei,
  • Zhang Xianpeng,
  • Zhang Yuliang,
  • Zhang Zhiyong,
  • Zhao Yingtan,
  • Zhou Liang,
  • Zhou Zuying,
  • Zhu Danyang,
  • Zhu Kejun,
  • Zhu Peng

DOI
https://doi.org/10.1051/epjconf/202023917018
Journal volume & issue
Vol. 239
p. 17018

Abstract

Read online

The China spallation neutron source (CSNS) was built and started running since 2018. It produces neutrons by impinging 1.6 GeV protons onto a tungsten target with 25 Hz repetition frequency. A beam line exploiting the back-streaming neutrons (Back-n) was built mainly for nuclear data measurement and started commissioning simultaneously with CSNS in 2018. There are two experimental endstations along the Back-n beam line: endstation 1 (#ES1) with a neutron flight path of about 55 m and endstation 2 (#ES2) with about 76 m. The neutron energy spectra of both #ES1 and #ES2 were measured since it is important for feasibility study and analysis. In this paper, the measurement of the neutron energy spectrum of Back-n #ES1 is reported. It is measured by a multi-layer fission chamber using the 235U samples as the neutron converters. The neutron energy spectrum from 0.1 eV to 30 MeV is obtained. The integral neutron flux (from 0.1 eV to 30 MeV) normalized to the proton beam power of 100 kW is 1.55×107 neutrons/cm2/s.