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Photomeson production is studied on the basis of the hypothesis of charge independence combined with the suggestion from meson theory that the meson-nucleon state of angular momentum and isotopic angular momentum equal to 3/2 is one of strong, resonant interaction. Reasonable agreement with experiment is obtained, both as to the energy dependence of the cross sections and as to their ratios. Similar considerations lead to a possible explanation for the angular dependence of π⁺ mesons produced in p-p collisions.
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Brueckner et al. (1952) studied this question.
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