On meson exchange currents and nucleon polarizability effects in proton-proton Bremsstrahlung

The proton-proton Bremsstrahlung below the pion production threshold is considered. The corrections to leading potential model amplitudes include newly introduced, nucleon polarizability dependent term and the meson exchange currents with account for the Δ-isobar excitation and the vector meson-pion transition currents. Both unpolarized and polarized cross sections are considered with conclusion that measurements of the proton spin-correlation coefficients are most promising to pin down the new, nucleon spin- and structure-dependent corrections. 17 refs., 4 figs