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Irradiation with 100 Mev x-rays has been found to produce Zn⁶³ from copper and Mg²⁷ from aluminum. Experiments involving variations in beam energy and target thickness have shown that these isotopes result from secondary reactions caused by photo-neutrons and photo-protons from the target materials rather than from any primary, x-ray induced processes. No evidence for gamma-meson reactions has been obtained. A search for the transmutation products of gamma-meson reactions is shown to compare favorably in sensitivity with cloud-chamber methods for the detection of meson production, provided mesons are produced singly.
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Bonner et al. (1947) studied this question.
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