Forward p(n,d)γ cross sections above the pion production threshold

Differential cross section measurements for the radiative capture reaction p(n,d)γ at 0°–3° laboratory angle and neutron energies of 360, 410 and 460 MeV (corresponding to photon lab energies of 182.5, 207.7 and 232.5 MeV for the inverse reaction) have been made using the TRIUMF medium resolution spectrometer. These data complement measured photo-disintegration differential cross sections at forward angles in this energy range and are the first capture cross sections at 0° above the pion-production energy threshold. The results are in qualitative agreement with three recent theoretical treatments of this reaction.