Abstract
The energy dependence of the relative yield of delayed neutrons and half-life of their precursor nuclei from 238U fission by 14.2–17.9 MeV neutrons is measured. In addition, the detector-blocking effect, which is due to the exposure of the detector to intense fluxes of high-energy neutrons, and the effect of the secondary neutron source D(d, n)3He, a reaction which occurs when a T(d, n)4He based neutron source is used, are investigated experimentally and taken into account in the data analysis. The data are analyzed in terms of the average half-life of the precursor nuclei of the delayed neutrons. It is shown that the observed increase of with increasing primary-neutron energy in the energy range studied is predominantly due to the opening of emissive nuclear fission channels. The energy dependence of the average half-life of the delayed-neutron precursors can be described on the basis of the model of emissive fission of three nuclei that fission in this energy range − 237U*, 238U*, and 239U*.
Published Version
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