The differential cross section for Compton scattering on protons is calculated at various energies in the region of and above the peak corresponding to the 3-3 pion-nucleon resonance. For this, the unitarity of the S matrix and a set of approximate dispersion relations for the scattering amplitudes is used. Small admixtures of electric quadrupole in the radiation that produces the first photopion resonance are shown to affect the angular distribution significantly. In the region of the second photopion peak the resonant behavior is found to be clearly reflected on the proton Compton effect.
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A. P. Contogouris (1961) studied this question.
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