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

近期发现有不法分子冒充我刊与作者联系，借此进行欺诈等不法行为，请广大作者加以鉴别，如遇诈骗行为，请第一时间与我刊编辑部联系确认（《中国物理C》（英文）编辑部电话：010-88235947,010-88236950），并作报警处理。

本刊再次郑重声明：

（1）本刊官方网址为cpc.ihep.ac.cn和https://iopscience.iop.org/journal/1674-1137

（2）本刊采编系统作者中心是投稿的唯一路径，该系统为ScholarOne远程稿件采编系统，仅在本刊投稿网网址（https://mc03.manuscriptcentral.com/cpc）设有登录入口。本刊不接受其他方式的投稿，如打印稿投稿、E-mail信箱投稿等，若以此种方式接收投稿均为假冒。

（3）所有投稿均需经过严格的同行评议、编辑加工后方可发表，本刊不存在所谓的“编辑部内部征稿”。如果有人以“编辑部内部人员”名义帮助作者发稿，并收取发表费用，均为假冒。

《中国物理C》（英文）编辑部

2024年10月30日

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

Abstract
HTML
Reference
Related

PDF

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]	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
[7]	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
[8]	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
[9]	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
[10]	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
[11]	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
[12]	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.
[13]	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
[14]	Liu Guoxing , Chen Keliang , Yu Xian , Dai Guangxi . Fission Angular Distributions for the Incomplete Fusion Reactions. Chinese Physics C, 1997, 21(S3): 35-42.
[15]	Fan Tieshuan , Hu Jimin , Bao Shanglian . Multichannel Fission Model Applied to ^223,235,238U (n,f). Chinese Physics C, 1996, 20(5): 422-429.
[16]	Fan Tieshuan , Hu Jimin , Bao Shanglian . Multichannel Fission Model Applied to ^233,235,238U(n,f). Chinese Physics C, 1996, 20(S2): 187-195.
[17]	Fan Tieshuan , Hu Jimin , Bao Shanglian . The Multichannel Fission Model Applied to ²³⁵U(n,f). Chinese Physics C, 1994, 18(S1): 47-55.
[18]	Dai Guangxi . The Shape and Potential of Hot Nuclei in Symmetric Ternary Fission. Chinese Physics C, 1992, 16(S3): 305-311.
[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.

Access

Get Citation

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

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

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

Article Metric

Article Views(2164)
PDF Downloads(209)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
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.