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 promptγ-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 by²³⁹Pu 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 for²³³U(n, f) reaction by the semi-empirical method. Chinese Physics C, 2014, 38(5): 054001.doi:10.1088/1674-1137/38/5/054001
[5]	SUN Qian,SHANGGUAN Dan-Hua,BAO Jing-Dong. A dumbbell model with five parameters describing nuclear fusion or fission. Chinese Physics C, 2013, 37(1): 014102.doi:10.1088/1674-1137/37/1/014102
[6]	CHEN Yong-Jing,JIA Min,TAO Xi,QIAN Jing,LIU Ting-Jin,SHU Neng-Chuan. Calculation of prompt fission neutron spectra for²³⁵U(n,f). Chinese Physics C, 2012, 36(4): 322-328.doi:10.1088/1674-1137/36/4/005
[7]	ZHENG Na,ZHONG Chun-Lai,FAN Tie-Shuan. Multi-modal calculations of prompt fission neutrons from²³⁸U(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 for²³⁵U(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 of²³⁵U. 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 for²³⁵U(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 of²²⁸Ac. 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 to²³⁵U(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 of²³²Th. 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 the²³⁵U(n, f) reaction were performed with a semi-empirical method forE_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.