Proton-proton bremsstrahlung below and above pion-threshold: the influence of the -isobar
Abstract
The proton-proton bremsstrahlung is investigated within a coupled-channel model with the degree of freedom. The model is consistent with the NN scattering up to 1 GeV and the γ N vertex determined in the study of pion photoproduction reactions. It is found that the excitation can significantly improve the agreements with the pp → ppγ at Elab=280 MeV. Predictions at Elab=550 and 800 MeV are presented for future experimental tests.
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