Vm. Piksaikin et al., Features of the energy dependence of the total yields of delayed neutrons from U-235 and Np-237 fission induced by fast neutrons, PHYS ATOM N, 62(8), 1999, pp. 1279-1288
Experimental results are presented for the total yields of delayed neutrons
from U-235 and Np-237 fission induced by neutrons with energies in the ran
ge 0.7-5.0 MeV. The total yield of delayed neutrons from Np-237 fission ind
uced by neutrons with energies in the range 1-4 MeV has been found to depen
d greatly on energy. It has been shown that the character of the energy dep
endence of the total yield of delayed neutrons originating from the fission
of heavy nuclei is controlled by the emission of prompt fission neutrons.