Neutron-Proton Differential Cross Section at 129 and 150 MeV

The differential cross section for neutron-proton scattering has been measured from 70^∘{} to 180^∘{} (center-of-mass system) at energies of 129±{}1 and 150±{}1 MeV. A neutron beam was used which has an energy width of 6 MeV. The data have relative errors of from 3 to 4%. They have been normalized to total-cross-section data with the aid of phase-shift analyses; differences between various solutions imply an uncertainty in the absolute value of these cross-section data of as much as 6.5%. The data at 150 MeV are shown to be more reasonable than previous data in this energy region. The data at 129 MeV agree well with earlier work.