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The photon-nucleon production of π-mesons has been calculated incorporating in the interaction a Pauli-type term representing the interaction of the photon with the anomalous magnetic moments of the nucleons. The effect of the added interaction for the scalar theory is to increase somewhat the charged meson production while leaving the neutral production virtually unchanged. For the pseudoscalar theory the charged meson production is relatively unaffected while the neutral meson production is greatly enhanced. Comparison with the neutral meson experiments in hydrogen therefore favors the pseudoscalar theory.
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M. F. Kaplon (1951) studied this question.
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