Prompt fission neutron spectra of 235U above emissive fission threshold
2005
Abstract Statistical model calculations of prompt fission neutron spectra (PFNS) from 235 U( n , F ) reaction were performed for incident neutron energies up to E n ∼ 20 MeV . Exclusive spectra of the pre-fission (pre-saddle) ( n , x n f ) reaction neutrons, were calculated with Hauser–Feshbach statistical model, fission and ( n , x n ) reaction cross section data being described consistently. Spectra of neutrons, evaporated from the fission fragments, were approximated as a sum of two Watt distributions. The reduced neutron velocity in the center-of-mass system due to the neutron emission during fragment acceleration was assumed. PFNS component due to pre-saddle neutrons is evidenced in the shape of the measured PFNS data. We show it to be strongly correlated with the emissive fission contributions to the observed fission cross sections.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
56
References
15
Citations
NaN
KQI