Neutron-Proton Bremsstrahlung Inclusive Photon Experiment at LANSCE/WNR.

Neutron-proton bremsstrahlung (npγ) is the lowest energy inelastic process by which a photon is produced when two nucleons undergo a collision mediated by the strong interaction. An experiment performed at the LANSCE/WNR facility to measure photons produced in these inelastic neutron-proton collisions is near completion. The npγ inclusive photon measurements were performed to investigate the nucleon-nucleon interaction and provide cross sections for high energy γ-ray production in heavy-ion reactions. Data has been analyzed for incident neutron energies between 40 and 400 MeV and photon energies above 40 MeV at γ-ray angles of 90^circ and 117^circ. Detector elements from the highly segmented γ-ray telescope(GRT) were calibrated at the Saskatchewan Accelerator Laboratory Tagged Photon Facility to benchmark simulation codes used to model the GRT. Preliminary results of the inclusive photon measurement will be shown. The extraction of npγ from the inclusive spectra will be presented with a comparison to theory.