Abstract
The cross section for proton-proton bremsstrahlung is calculated for both coplanar and noncoplanar events using the Hamada-Johnston and Reid (soft-core) potentials. Agreement is obtained with the experimental data for angular distributions and cross sections integrated over the photon directions. We present a detailed analysis of the kinematics, the phase space and the matrix element in the neighborhood of the kinematic limit of noncoplanarity. We find a rapid decrease of the cross section integrated over photon angles as this limit is approached. This is due not to a strong variation of the phase space, which is essentially constant, but to the fact that near the kinematic limit for noncoplanarity of the protons, the photon is restricted to angles for which the probability for emission is small. For low energies (⪅ 30 MeV) of the incident proton, we give analytic expressions for the scattering amplitude, valid for coplanar as well as for noncoplanar events.
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