Neutron Proton Bremmsstrahlung Inclusive Photon Measurement at LANSCE/WNR: Preliminary Results.

A series of experiments are underway at the LANSCE/WNR facility to measure Neutron Proton Bremsstrahlung (npγ). Bremsstrahlung is the lowest energy inelastic process by which a photon is produced when two nucleons undergo a strong interaction. 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 photon energies above 40 MeV and incident neutron energies between 40 and 400 MeV at γ-ray angles of 90^circ and 117^circ using a highly segmented γ-ray telescope (GRT). The detector elements were calibrated at the Saskatchewan Accelerator Laboratory (SAL) using the Tagged Photon Facility to benchmark simulation codes used to model the GRT. Preliminary results of the inclusive photon measurement incorporating results from SAL will be shown. The extraction of npγ from the inclusive spectra will be detailed with a comparison to theory.