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The x-rays from a 22-Mev betatron were used to observe the thresholds for 23 photo-nuclear reactions which are listed in Table I. The observed thresholds are compared with the mass data for the lighter elements and with those obtained from an empirical treatment of the masses for the heavier elements.The excitation curves were extended up to 21 Mev in a few cases. These curves were very much alike except that for the Ta(γ,n) reaction. This curve showed an abrupt decrease in slope at about 18 Mev which indicates a much reduced cross section for photons above this energy.
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McElhinney et al. (1949) studied this question.
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