The neutron-proton bremmstrahlung cross-section was measured at a neutron energy of 76 MeV. Outgoing protons and neutrons were detected at extreme forward laboratory angles. Measurements were compared with a soft-photon-approximation calculation. Non-coplanar events were also studied.
Dupont, C., Deom, C., Leleux, P., Lipnik, P., Macq, P., Ninane, A., Pestieau, J., Kitwanga, S. W., & Wauters, P. (1988). The hard neutron-proton bremsstrahlung at 76 MeV. Nuclear Physics, Section A, A481(3), 424-444. https://doi.org/10.1016/0375-9474(88)90337-5 (Original work published 1988)