Abstract
The effect of an isovector natural parity (A 2) exchange amplitude in π o and ω photo-production at high energy from hydrogen, deuterium, and complex nuclei is investigated. The predictions of two phenomenological models are compared with experiment and are found to be in fair agreement, although more accurate data could distinguis the models. Photoproduction of ω from complex nuclei may be affected strongly by the existence of A 2 exchange contributions of the magnitude suggested by the vector dominance model.
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