Measurement of the <sup>232</sup>Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n

Zhi-Zhou Ren; Yi-Wei Yang; Yong-Hao Chen; Rong Liu; Bang-Jiao Ye; Jie Wen; Hai-Rui Guo; Zi-Jie Han; Qi-Ping Chen; Zhong-Wei Wen; Wei-Li Sun; Han Yi; Xing-Yan Liu; Tao Ye; Jiang-Bo Bai; Qi An; Jie Bao; Yu Bao; Ping Cao; Hao-Lei Chen; Zhen Chen; Zeng-Qi Cui; Rui-Rui Fan; Chang-Qing Feng; Ke-Qing Gao; Xiao-Long Gao; Min-Hao Gu; Chang-Cai Han; Guo-Zhu He; Yong-Cheng He; Yang Hong; Yi-Wei Hu; Han-Xiong Huang; Xi-Ru Huang; Hao-Yu Jiang; Wei Jiang; Zhi-Jie Jiang; Han-Tao Jing; Ling Kang; Bo Li; Chao Li; Jia-Wen Li; Qiang Li; Xiao Li; Yang Li; Jie Liu; Shu-Bin Liu; Ze Long; Guang-Yuan Luan; Chang-Jun Ning; Meng-Chen Niu; Bin-Bin Qi; Jie Ren; Xi-Chao Ruan; Zhao-Hui Song; Kang Sun; Zhi-Jia Sun; Zhi-Xin Tan; Jing-Yu Tang; Xin-Yi Tang; Bin-Bin Tian; Li-Jiao Wang; Peng-Cheng Wang; Zhao-Hui Wang; Xiao-Guang Wu; Xuan Wu; Li-Kun Xie; Xiao-Yun Yang; Li Yu; Tao Yu; Yong-Ji Yu; Guo-Hui Zhang; Lin-Hao Zhang; Qi-Wei Zhang; Xian-Peng Zhang; Yu-Liang Zhang; Zhi-Yong Zhang; Lu-Ping Zhou; Zhi-Hao Zhou; Ke-Jun Zhu

doi:10.1007/s41365-023-01271-7

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Measurement of the ²³²Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2023-09-19

- Measurement of the ²³²Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n
- Nuclear Science and Techniques Vol. 34, Issue 8, Article number: 115(2023)
- Affiliations：
  
  1.Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
  2.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
  3.Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
  4.Spallation Neutron Source Science Center, Dongguan 523803, China
  5.Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  6.State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230027, China
  7.Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
  8.School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China
  9.State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
  10.State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics Chinese Academy of Sciences, Beijing, China
  11.Northwest Institute of Nuclear Technology, Xi’an 710024, China
  12.University of Chinese Academy of Sciences, Beijing 100049, China
  13.Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  * liurongzy@163.com
- Funds：
- DOI：10.1007/s41365-023-01271-7
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Zhi-Zhou Ren, Yi-Wei Yang, Yong-Hao Chen, et al. Measurement of the ²³²Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n. [J]. Nuclear Science and Techniques 34(8):115(2023)
DOI：

Zhi-Zhou Ren, Yi-Wei Yang, Yong-Hao Chen, et al. Measurement of the ²³²Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n. [J]. Nuclear Science and Techniques 34(8):115(2023) DOI： 10.1007/s41365-023-01271-7.

摘要

Abstract

The ,232,Th(n,f) cross-section is very important in basic nuclear physics and applications based on the Th/U fuel cycle. Using the time-of-flight method and a multi-cell fast fission ionization chamber, a novel measurement of the ,232,Th(n,f) cross-section relative to ,235,U in the 1–200 MeV range was performed at the China Spallation Neutron Source Back-n white neutron source (Back-n). The fission event-neutron energy spectra of ,232,Th and ,235,U fission cells were measured in the single-bunch mode. Corrected ,232,Th/,235,U fission cross-section ratios were obtained, and the measurement uncertainties were 2.5–3.7% for energies in the 2–20 MeV range and 3.6–6.2% for energies in the 20–200 MeV range. The ,232,Th(n,f) cross-section was obtained by introducing the standard cross-section of ,235,U(n,f). The results were compared with those of previous theoretical calculations, measurements, and evaluations. The measured ,232,Th fission cross-section agreed with the main evaluation results in terms of the experimental uncertainty, and ,232,Th fission resonances were observed in the 1–3 MeV range. The present results provide ,232,Th(n,f) cross-section data for the evaluation and design of Th/U cycle nuclear systems.

关键词

Keywords

232Th(nf) cross sectionFast-fission ionization chamberBack-n white neutron source

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Measurement of the 232Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n

DOI：10.1007/s41365-023-01271-7

摘要

Abstract

关键词

Keywords

references

Measurement of the ²³²Th(n,f) cross-section in the 1–200 MeV range at the CSNS Back-n