The neutron-proton capture differential cross section has been measured at extreme forward and backward angles for 72-MeV neutron energy corresponding to a gamma -ray energy of 38.2 MeV in the inverse reaction. The results agree well with recent photodisintegration data at forward angles, but only partially with potential model calculations.
Gilot, JF., Bol, A., Leleux, P., Lipnik, P., & Macq, P. (1981). Forward-angle and Backward-angle Differential Cross-section for Neutron-proton Capture At 72 Mev. Physical Review Letters, 47(5), 304-307. https://doi.org/10.1103/PhysRevLett.47.304 (Original work published 1981)