Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 1994, Vol. 5 ›› Issue (2): 71

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MEASUREMENT OF PROMPT NEUTRON SPECTRA OF 238U FISSION INDUCED BY 10.17 AND 12.12 MeV NEUTRONS

Li Anli(李安利), Bai Xixiang(白希祥), Wang Xiaozhong(王效中), Meng Jiangchen(孟江辰), Wang Yufeng(王宇峰),Liu Weiping(柳卫平), Yuan Yuan(袁媛), Qi Dahai(戚大海) and Huang Shengnian(黄胜年)   

  1. China Institute of Atomic Energy, Betjing 102413, China
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Li Anli(李安利), Bai Xixiang(白希祥), Wang Xiaozhong(王效中), Meng Jiangchen(孟江辰), Wang Yufeng(王宇峰), Liu Weiping(柳卫平), Yuan Yuan(袁媛), Qi Dahai(戚大海) and Huang Shengnian(黄胜年). MEASUREMENT OF PROMPT NEUTRON SPECTRA OF 238U FISSION INDUCED BY 10.17 AND 12.12 MeV NEUTRONS.Nuclear Science and Techniques, 1994, 5(2): 71

Abstract: Experimental method to measure the prompt neutron spectra of 238U fission induced by fast neutrons has been developed at HI-13 Tandem Van de Graaff Accelerator Laboratory of CIAE. These techniques employ a multi-segment fission chamber and two liquid scintillator neutron detectors. TOF (time of flight) techniques are used for primary neutrons to select the fission events induced by monoenergetic neutron from 7H(d, n) reactions instead of breakup neutrons from 7H(d, np) reactions. The fission neutron TOF spectra are measured in coincidence with the fission fragments to distinguish fission neutrons from other secondary neutrons. The method permits measurements to a fairly good accuracy under large neutron and gamma ray background. The techniques are described and experimental spectra are presented.

Key words: Fission neutron spectrum, TOF technique, Fission induced by fast neutron, Uranium 238