Prompt fission neutron spectra of 238U and 232Th above emissive fission threshold

V. M. Maslov, Yu V. Porodzinskij, M. Baba, A. Hasegawa, N. V. Kornilov, A. B. Kagalenko, N. A. Tetereva

研究成果: Article査読

30 被引用数 (Scopus)


Statistical model calculations were performed to interpret the prompt fission neutron spectra (PFNS) from 238U(n,f) and 232Th(n,f) reactions for the incident neutron energies En ∼ 6-18 MeV. Spectra of the prefission (presaddle) (n,xnf) reaction neutrons were calculated with Hauser-Feshbach statistical model, fission and (n,xn) 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 presaddle 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. The dependence of these contributions on the target nuclide fissility and incident neutron energy is shown to be pronounced in the PFNS shapes for 232Th(n,f) and 238U(n,f) reactions. High-energy tails of the first neutrons of (n,nf) and (n,2nf) reactions are shown to be evidenced in the PFNS measured data trends.

ジャーナルPhysical Review C - Nuclear Physics
出版ステータスPublished - 2004 3月

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学


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