Abstract
The time-energy behaviour of fast neutrons has been studied in cubic assemblies of carbon, aluminium, iron and lead, with a plane monoenergetic pulsed wave of neutrons impinging on the face of the cube. Two other measurements have been performed on a graphite sphere, with a central isotropic source, and on a slab of graphite, with plane source. The source energy has been chosen in the range of 1·66–2·06 MeV. A stilbene detector has been used as the neutron spectrometer. The neutron spectrum has been measured, mostly on the front or the back face of the assembly, with an energy resolution of 200keV. The results of the spherical geometry measurement have been compared with a Monte-Carlo calculation: the agreement is fairly good. The other results show up the effect of the inelastic scattering (doubly peaked neutron spectrum) and of the valleys or the peaks in the total cross sections.
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