Measurement of the prompt neutron spectrum from thermal-neutron-induced fission in U-235 using the recoil proton method
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A measurement of the 235U prompt fission neutron spectrum (PFNS) by the recoil proton method was performed at the Institute of Nuclear Physics and Chemistry, China. Details of the method, which include the calculation and validation of the response matrix, are presented. The PFNS for 235U in the energy range 1–12 MeV, induced by thermal neutrons, was obtained. The measured spectrum in the low-energy region was in good agreement with previous work and the ENDF/B-VII library, except for minor differences. In the high-energy region, however, the relative height of the measured spectrum was greater, and an analysis of the experiment indicated uncertainties of 13% at 10 MeV and 24% at 12 MeV. Experimental results showed that the recoil proton method could be used to measure prompt fission neutron spectra. Some directions for future work are included.
KeywordsPrompt fission neutron spectra Recoil proton method Response matrix U-235
We would like to thank Prof. Zhu An from Sichuan University for helpful discussion and Jianming Song and Wei Luo from INPC for providing a high-performance thermal neutron source. We wish to thank Benchao Lou and Yan Li from INPC for providing the D-T neutron source.
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