Measurement of Absolute np Scattering Differential Cross Sections with a Tagged Intermediate-Energy Neutron Beam

I report the results of a new measurement of np elastic scattering cross sections, aimed at resolving discrepancies in the database at intermediate energies and at providing a new, accurate standard for neutron-induced cross sections in this energy regime. The approach exploits a tagged neutron beam in a kinematically complete double-scattering experiment, keeping systematic errors in the absolute cross sections below +2%. The results are in very good agreement with previous partial-wave analyses of the database, and they deviate systematically from some other recent experimental results that were excluded from those partial wave analyses