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Photoproduction cross sections of charged pi mesons from hydrogen and deuterium have been measured as a function of meson angle at gamma-ray energies of 200, 235, and 265 Mev. The angular range extends from 30° to 180° in the laboratory system. Absolute cross sections have been determined. A least-squares fit of the measured cross sections has been made to the expression A+Bcosθ+Csin2θ, which assumes only S and P wave scattering. The coefficients so determined are qualitatively consistent with electric and magnetic dipole absorption together with the assumption of a resonant state of angular momentum 32 and of energy close to 300 Mev. Comparison with neutral meson production indicates some direct charged meson production in the P state.

2 data tables

Table 1

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Table 2

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CM Energies (GeV)

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Scattering of Bev Electrons by Hydrogen and Deuterium

Electromagnetic Properties of the Proton and Neutron

Photoproduction of pi+ Mesons from Hydrogen in the Region 350-900 Mev

Proton-proton interactions at 5.3 BeV

Photoproduction of Charged Pi Mesons from Hydrogen and Deuterium