Inelastic neutron scattering and prompt fission neutron spectra for Np-237

The secondary neutron spectra (inelastic, elastic, fission) for Np-237 were measured by the neutron time of flight spectrometer of the IPPE at the inc ident energy range 1-2.5 MeV. The solid tritium target was used as a neutro n source. The neptunium oxide (189 g) packed in the low mass stainless stee l container was used as a scattering sample. The neutron background due to scattering on the target environment and tritium into the target backing wa s measured and was calculated with the appropriate model of the neutron sou rce. The data were corrected for neutron background, the scattering on the oxygen and iron nuclei, and the effect of the finite sample size. The fissi on neutron spectral were measured, evaluated and subtracted from the emissi on neutron spectra to estimate inelastic neutron spectra and cross-sections . The experimental results were compared with ENDF/B-VI, BROND-2, JENDL-3 n eutron data libraries. (C) 2000 Elsevier Science Ltd. All rights reserved.