Measurement of the $^{239}\mathrm{Pu}(n,f)$ cross section from 4 keV to 100 MeV using the white neutron source at the CSNS Back-n facility

Measurement of the ${}^{239}{Pu} (n, f)$ cross section from 4 keV to 100 MeV using the white neutron source at the CSNS Back-n facility

Yijia Qiu, Changlin Lan, Yonghao Chen, Liyang Jiang, Jie Bao, Yiwei Yang, Zhongwei Wen, Rong Liu, Xichao Ruan, Jingyu Tang, Jie Ren, Hantao Jing, Guangyuan Luan, Ruirui Fan, Yangbo Nie, Xianlin Yang, Xiaojun Li, Han Yi, Wei Jiang, Tao Ye, Yi Yang, Shilong Liu, and Jincheng Wang

Phys. Rev. C 107, 024606 – Published 13 February 2023

Abstract

The neutron-induced fission cross section of ${}^{239}{Pu}$ was measured relative to ${}^{235}U (n, f)$ at the back-streaming white neutron beam line (Back-n) of the China Spallation Neutron Source (CSNS). A multicell fast fission ionization chamber was used to perform the measurement. The reliability of the measurement was verified by the high consistency of ${}^{235}U$ 's resonances between the measurement and the evaluation data. The ${}^{239}{Pu}$ fission cross sections from $4 keV$ to $100 MeV$ are obtained with 1.7–5.8 % uncertainty when unfolding uncertainties are excluded. The total uncertainties including the unfolding errors, which reflect the effect of the double-bunch unfolding method, are 2.6–15 % from $10 keV$ to $100 MeV$ .

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Received 10 March 2022
Accepted 25 January 2023

DOI:https://doi.org/10.1103/PhysRevC.107.024606

Physics Subject Headings (PhySH)

Fission

A ≥ 220

Spectrometers & spectroscopic techniques

Nuclear Physics

Authors & Affiliations

Yijia Qiu ¹, Changlin Lan ^1,*, Yonghao Chen ^2,3,†, Liyang Jiang⁴, Jie Bao⁴, Yiwei Yang⁵, Zhongwei Wen⁵, Rong Liu⁵, Xichao Ruan⁴, Jingyu Tang^2,3, Jie Ren⁴, Hantao Jing^2,3, Guangyuan Luan ⁴, Ruirui Fan^2,3, Yangbo Nie⁴, Xianlin Yang¹, Xiaojun Li¹, Han Yi^2,3, Wei Jiang^2,3, Tao Ye⁶, Yi Yang⁴, Shilong Liu⁴, and Jincheng Wang⁴

¹School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
²Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China
³Spallation Neutron Source Science Center, Dongguan 523803, China
⁴Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
⁵Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
⁶Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

^*Corresponding author: lanchl@lzu.edu.cn
^†Corresponding author: chenyonghao@ihep.ac.cn

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Vol. 107, Iss. 2 — February 2023

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Physical Review C

covering nuclear physics

Measurement of the ${}^{239}{Pu} (n, f)$ cross section from 4 keV to 100 MeV using the white neutron source at the CSNS Back-n facility

Yijia Qiu, Changlin Lan, Yonghao Chen, Liyang Jiang, Jie Bao, Yiwei Yang, Zhongwei Wen, Rong Liu, Xichao Ruan, Jingyu Tang, Jie Ren, Hantao Jing, Guangyuan Luan, Ruirui Fan, Yangbo Nie, Xianlin Yang, Xiaojun Li, Han Yi, Wei Jiang, Tao Ye, Yi Yang, Shilong Liu, and Jincheng Wang

Phys. Rev. C 107, 024606 – Published 13 February 2023

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Physical Review C

covering nuclear physics

Measurement of the Pu239(n,f) cross section from 4 keV to 100 MeV using the white neutron source at the CSNS Back-n facility

Yijia Qiu, Changlin Lan, Yonghao Chen, Liyang Jiang, Jie Bao, Yiwei Yang, Zhongwei Wen, Rong Liu, Xichao Ruan, Jingyu Tang, Jie Ren, Hantao Jing, Guangyuan Luan, Ruirui Fan, Yangbo Nie, Xianlin Yang, Xiaojun Li, Han Yi, Wei Jiang, Tao Ye, Yi Yang, Shilong Liu, and Jincheng Wang

Phys. Rev. C 107, 024606 – Published 13 February 2023

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Measurement of the ${}^{239}{Pu} (n, f)$ cross section from 4 keV to 100 MeV using the white neutron source at the CSNS Back-n facility