Abstract
The spectra of neutrons emitted in fission of232Th,235U and238U induced by 2.9- and 14.7- MeV neutrons (below and above the chance fission threshold, respectively) were measured by the time-of-flight method. Two effects were observed in the prefission neutron spectra: the high-energy wing is related to the nonequilibrium mechanism of emission up to the well pronounced upper boundary of ɛmax=8.5 MeV; in the lower-energy wing e < 2 MeV, neutron yield exceeds conventional statistical model description. The latter effect was attributed to the fission process dynamics.
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Boikov, G.S., Dmitriev, V.D., Kudyaev, G.A. et al. New data on prefission neutrons. Z. Physik A - Hadrons and Nuclei 340, 79–84 (1991). https://doi.org/10.1007/BF01284483
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DOI: https://doi.org/10.1007/BF01284483