https://doi.org/10.1140/epja/s10050-024-01272-z
Regular Article - Experimental Physics
Measurement of the neutron flux of CSNS Back-n ES#1 under small collimators from 0.5 eV to 300 MeV
1
Institute of High Energy Physics, Chinese Academy of Sciences (CAS), 100049, Beijing, China
2
Spallation Neutron Source Science Center, 523803, Dongguan, China
3
State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
4
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, 519082, Zhuhai, Guangdong, China
5
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621900, Mianyang, China
6
School of Nuclear Science and Technology, University of Science and Technology of China, 230026, Hefei, China
7
State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, 230026, Hefei, China
8
School of Nuclear Science and Technology, Lanzhou University, 730000, Lanzhou, China
9
Department of Modern Physics, University of Science and Technology of China, 230026, Hefei, China
10
Institute of Modern Physics, Fudan University, 200433, Shanghai, China
11
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, 102413, Beijing, China
12
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, 100871, Beijing, China
13
Northwest Institute of Nuclear Technology, 710024, Xi’an, China
14
University of Chinese Academy of Sciences, 100049, Beijing, China
a
chenyonghao@ihep.ac.cn
p
lanchl@lzu.edu.cn
Received:
30
October
2023
Accepted:
19
February
2024
Published online:
15
March
2024
The newly built back-streaming white neutron beam line (Back-n) at China spallation Neutron Source (CSNS) makes a breakthrough for China’s domestic nuclear data measurement, which is pushing nuclear data measurement in China towards higher precision and wider energy range. The neutron flux of the facility was measured at the first beginning since it is an extremely important characterization for the experiment proposal and data analysis. The neutron fluxes under big collimators in end station 1 (ES#1) and end station 2 (ES#2) had been characterized by a fission chamber. In this paper, the first measurement of the neutron flux of Back-n ES#1 with small collimators is reported. The neutron flux from 0.5 eV to 300 MeV was measured by three detectors: a silicon monitor based on a 6LiF sample for the energy range below 200 keV, a fast multi-layer fission ionization chamber for the range from 10 keV to 300 MeV, and a proton recoil telescope for the high energy region from 10 to 70 MeV. The flux and its uncertainty with 50 bins per decade were finally evaluated by combining the data of the three detectors. The integrated flux in the full energy range at CSNS beam power of 100 kW is 1.642 × 106 n/cm2/s, which is consistent with the FLUKA simulation within a difference of about 4%.
Qi An: Deceased.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
