https://doi.org/10.1051/epjconf/202023917018
Measurement of the neutron energy spectrum of Back-n #ES1 at CSNS
1 Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
2 Spallation Neutron Source Science Center, Dongguan 523803, China
3 Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
4 State Key Laboratory of Particle Detection and Electronics
5 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
6 State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
7 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
8 University of South China, Hengyang 421001, China
9 Northwest Institute of Nuclear Technology, Xi’an 710024, China
10 Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China
11 School of Physics, Beihang University, Beijing 100083, China
12 Xi’an Jiaotong University, Xi’an 710049, China
* e-mail: baojie_ciae@126.com
Published online: 30 September 2020
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.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
