PHOTON SPECTRUM OF THE NEUTRON-PROTON BREMSSTRAHLUNG AT 170 MEV - CONTRIBUTIONS OF NP-]D-GAMMA TO INCLUSIVE PHOTON ENERGY SPECTRA FROM NP AND PD COLLISIONS NEAR 200 MEV - COMMENT

Several years ago, a measured photon energy spectrum from np collision s was presented as a measurement of free np Bremsstrahlung, and subseq uently theoretical groups compared the data to their model calculation s of the process np-->npy [F. Malek, A. Nifenecker, J.A. Pinston, F. S chussler, S. Drissi, J. Julien, Phys. Lett. B 266 (1991) 391]. We poin t out that in np collisions, np capture (np-->dy) is important and can not be ignored. It contributes approximately 30% of the cross section for photons above 40 MeV. Capture also makes a significant contributio n to the photon spectra produced in p-d collisions, and possibly has a role in p-nucleus collisions. In the former case, better agreement be tween theory and experiment is obtained when (quasifree) capture is in cluded.