Inelastic neutron scattering and prompt fission neutron spectra for 237Np

The secondary neutron spectra (inelastic, elastic, ®ssion) for 237Np were measured by the neu- tron time of ¯ight spectrometer of the IPPE at the incident energy range 1±2.5 MeV. The solid tritium target was used as a neutron source. The neptunium oxide (189 g) packed in the low mass stainless steel container was used as a scattering sample. The neutron background due to scat- tering on the target environment and tritium into the target backing was measured and was cal- culated with the appropriate model of the neutron source. The data were corrected for neutron background, the scattering on the oxygen and iron nuclei, and the e€ect of the ®nite sample size. The ®ssion neutron spectra were measured, evaluated and subtracted from the emission neutron spectra to estimate inelastic neutron spectra and cross-sections. The experimental results were compared with ENDF/B-VI, BROND-2, JENDL-3 neutron data libraries.