Prompt fission neutron spectra of n+<SUP>235</SUP>U above the (n,nf) fission threshold

SHU Neng-Chuan; JIA Min; CHEN Yong-Jing; LIU Ting-Jin

doi:10.1088/1674-1137/39/5/054101

Chinese Physics C> 2015, Vol. 39> Issue(5) : 054101 DOI: 10.1088/1674-1137/39/5/054101

Prompt fission neutron spectra of n+²³⁵U above the (n,nf) fission threshold

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Abstract：
Calculations of prompt fission neutron spectra (PFNS) from the ²³⁵U(n, f) reaction were performed with a semi-empirical method for E_n=7.0 and 14.7 MeV neutron energies. The total PFNS were obtained as a superposition of (n,xnf) pre-fission neutron spectra and post-fission spectra of neutrons which were evaporated from fission fragments, and these two kinds of spectra were taken as an expression of the evaporation spectrum. The contributions of (n,xnf) fission neutron spectra on the calculated PFNS were discussed. The results show that emission of one or two neutrons in the (n,nf) or (n,2nf) reactions influences the PFNS shape, and the neutron spectra of the (n,xnf) fission-channel are soft compared with the neutron spectra of the (n,f) fission channel. In addition, analysis of the multiple-chance fission component showed that second-chance fission dominates the PFNS with an incident neutron energy of 14.7 MeV whereas first-chance fission dominates the 7 MeV case.

[1]	Jian-Guo Qin , Cai-Feng Lai , Rong Liu , Tong-Hua Zhu , Xin-Wei Zhang , Bang-Jiao Ye . Monte Carlo simulation of prompt γ-ray spectra from depleted uranium under D-T neutron irradiation and electron recoil spectra in a liquid scintillator detector. Chinese Physics C, 2016, 40(3): 036201. doi: 10.1088/1674-1137/40/3/036201
[2]	TIAN Jian , WANG Ning , YE Wei . Langevin analysis of fission excitation functions induced by protons. Chinese Physics C, 2015, 39(3): 034102. doi: 10.1088/1674-1137/39/3/034102
[3]	ZENG Li-Na , WANG Qiang , SONG Ling-Li , ZHENG Chun . Influence of thermal and resonance neutron on fast neutron flux measurement by ²³⁹Pu fission chamber. Chinese Physics C, 2015, 39(1): 016001. doi: 10.1088/1674-1137/39/1/016001
[4]	CHEN Yong-Jing , JIA Min , LIU Ting-Jin , SHU Neng-Chuan . Calculation of prompt fission neutron spectrum for ²³³U(n, f) reaction by the semi-empirical method. Chinese Physics C, 2014, 38(5): 054001. doi: 10.1088/1674-1137/38/5/054001
[5]	CHEN Yong-Jing , JIA Min , TAO Xi , QIAN Jing , LIU Ting-Jin , SHU Neng-Chuan . Calculation of prompt fission neutron spectra for ²³⁵U(n,f). Chinese Physics C, 2012, 36(4): 322-328. doi: 10.1088/1674-1137/36/4/005
[6]	SONG Yu-Shou , Margaryan A , HU Bi-Tao , TANG Li-Guang . Performance of the low pressure MWPCs for fission fragments under a high background. Chinese Physics C, 2011, 35(8): 758-762. doi: 10.1088/1674-1137/35/8/011
[7]	ZHENG Na , ZHONG Chun-Lai , FAN Tie-Shuan . Multi-modal calculations of prompt fission neutrons from ²³⁸U(n, f) at low induced energy. Chinese Physics C, 2011, 35(10): 930-934. doi: 10.1088/1674-1137/35/10/008
[8]	CHEN Yong-Jing , LIU Ting-Jin . Prompt neutron multiplicity distribution for ²³⁵U(n,f) at incident energies up to 20 MeV. Chinese Physics C, 2011, 35(4): 344-348. doi: 10.1088/1674-1137/35/4/005
[9]	DONG Jian-Min , ZHANG Hong-Fei , ZUO Wei , LI Jun-Qing . Unified fission model for proton emission. Chinese Physics C, 2010, 34(2): 182-185. doi: 10.1088/1674-1137/34/2/005
[10]	ZHENG Na , FAN Tie-Shuan , DING Yi , ZHONG Chun-Lai , LI Xiang-Qing , CHEN Jin-Xiang . Multi-modal analysis for low energy neutron-induced fission of ²³⁵U. Chinese Physics C, 2010, 34(1): 49-55. doi: 10.1088/1674-1137/34/1/009
[11]	CHEN Yong-Jing , LIU Ting-Jin , SHU Neng-Chuan . Research on the prompt neutron multiplicity of fission fragments for ²³⁵U(n,f). Chinese Physics C, 2010, 34(7): 953-957. doi: 10.1088/1674-1137/34/7/005
[12]	WANG Kun , MA Yu-Gang , ZHENG Qing-Shan , CAI Xiang-Zhou , FANG De-Qing , FU Yao , LU Guang-Cheng , TIAN Wen-Dong , WANG Hong-Wei . Temperature dependent fission fragment distribution in the Langevin equation. Chinese Physics C, 2009, 33(S1): 119-122. doi: 10.1088/1674-1137/33/S1/038
[13]	YUAN Shuang-Gui , XU Yan-Bing , DING Hua-Jie , YANG Wei-Fan , NIU Yan-Ning , XIAO Yong-Hou . β-delayed fission of ²²⁸Ac. Chinese Physics C, 2008, 32(S2): 53-55.
[14]	LIU Ting-Jin , SUN Zheng-Jun , SHU Neng-Chuan . Systematics on fission fragment mass distribution of neutron induced 235U fission. Chinese Physics C, 2008, 32(7): 556-560. doi: 10.1088/1674-1137/32/7/009
[15]	Liu Guoxing , Chen Keliang , Yu Xian , Dai Guangxi . Fission Angular Distributions for the Incomplete Fusion Reactions. Chinese Physics C, 1997, 21(S3): 35-42.
[16]	Fan Tieshuan , Hu Jimin , Bao Shanglian . Multichannel Fission Model Applied to ^223,235,238U (n,f). Chinese Physics C, 1996, 20(5): 422-429.
[17]	Fan Tieshuan , Hu Jimin , Bao Shanglian . Multichannel Fission Model Applied to ^233,235,238U(n,f). Chinese Physics C, 1996, 20(S2): 187-195.
[18]	Fan Tieshuan , Hu Jimin , Bao Shanglian . The Multichannel Fission Model Applied to ²³⁵U(n,f). Chinese Physics C, 1994, 18(S1): 47-55.
[19]	Dai Guangxi , Li Weisheng . Exploration of Optimum Shape in Symmetric Fission. Chinese Physics C, 1988, 12(S4): 399-404.
[20]	Sun Tongyu , Li Wenxin , Dong Tianrong , Fu Ming . Mass Distribution in the 14.7 MeV Neutron-induced Fission of ²³²Th. Chinese Physics C, 1988, 12(S1): 99-107.

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SHU Neng-Chuan, JIA Min, CHEN Yong-Jing and LIU Ting-Jin. Prompt fission neutron spectra of n+²³⁵U above the (n,nf) fission threshold[J]. Chinese Physics C, 2015, 39(5): 054101. doi: 10.1088/1674-1137/39/5/054101

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Received: 2014-08-26
Revised: 2014-10-16

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沈阳化工大学材料科学与工程学院沈阳 110142

Prompt fission neutron spectra of n+²³⁵U above the (n,nf) fission threshold

Corresponding author: CHEN Yong-Jing,

Received Date: 2014-08-26
Accepted Date: 2014-10-16
Available Online: 2015-05-05

Abstract: Calculations of prompt fission neutron spectra (PFNS) from the ²³⁵U(n, f) reaction were performed with a semi-empirical method for E_n=7.0 and 14.7 MeV neutron energies. The total PFNS were obtained as a superposition of (n,xnf) pre-fission neutron spectra and post-fission spectra of neutrons which were evaporated from fission fragments, and these two kinds of spectra were taken as an expression of the evaporation spectrum. The contributions of (n,xnf) fission neutron spectra on the calculated PFNS were discussed. The results show that emission of one or two neutrons in the (n,nf) or (n,2nf) reactions influences the PFNS shape, and the neutron spectra of the (n,xnf) fission-channel are soft compared with the neutron spectra of the (n,f) fission channel. In addition, analysis of the multiple-chance fission component showed that second-chance fission dominates the PFNS with an incident neutron energy of 14.7 MeV whereas first-chance fission dominates the 7 MeV case.