Photon angular distribution of proton-proton bremsstrahlung at 190 MeV

High-precision cross sections and analyzing powers have been measured for proton-proton bremsstrahlung at an incident energy of 190 MeV. A large part of the total reaction phase space has been covered in two separate measurements in which all reaction products were detected. Photon angular distributions for a number of proton angle combinations are presented and compared to theoretical models. The discrepancy between the experimental and theoretical values of the cross sections becomes larger at smaller values of relative energy of the two outgoing protons pointing to the fact that other effects such as those due to the Coulomb force should be investigated more thoroughly. The simplest photonuclear process remains to be fully understood.