Bremsstrahlung in High Energy Nucleon-Nucleon Collisions

Field-theoretic calculations are made of the electromagnetic radiation accompanying a proton-neutron collision. The nucleons are treated non-relativistically, and it is assumed that their scattering is produced either by a scalar meson field with scalar coupling or a pseudoscalar field with pseudoscalar coupling. The resulting energy spectrum for the photons has the form $\frac{{(\frac{1}{2}{E}_0-ck)}^{\frac{1}{2}}\mathrm{dk}}{k}$ for the scalar field and ${(\frac{1}{2}{E}_0-ck)}^{\frac{1}{2}}\mathrm{kdk}$ for the pseudoscalar field. The ratio of the intensity at 90° to 0° (in the CM system) is about 100 for the scalar theory and about 1 for the pseudoscalar case for incident energies of about 200 Mev. Integrated cross sections are obtained for both theories. The yield decreases with energy for the scalar field and increases for the pseudoscalar field.