1977•Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)Requires access

Prompt fission neutron spectra

L. Stewart, C.M. Eisenhauer

Abstract

Recent measurements of the spectra of prompt neutrons emitted from neutron-induced fission in /sup 235/U and /sup 239/Pu are reviewed. Results are discussed in terms of departures of the data from a simple Watt representation. An evaluation of the neutron spectrum from neutron-induced fission in /sup 235/U and spontaneous fission in /sup 252/Cf, made by NBS in 1975, is also reviewed. Recent measurements on the fission spectra of /sup 235/U and /sup 239/Pu seem to indicate a harder energy spectrum than indicated by the earlier data available for the NBS evaluation. Posible reasons for this trend in the experimental data are discussed. 7 figures, 1 table.

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Key concepts: Fission, Nuclear physics, Neutron, Spectral line, Delayed neutron, Physics, Neutron emission, Prompt neutron