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

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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

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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.

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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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通讯作者: 陈斌, [email protected]

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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.