The number of neutrons evaporated by nuclei excited by Li(p,γ) photons is calculated along the compound nucleus formalism. It is found, for light nuclei, to be very small and to exhibit an odd-even alternation. From experimental cross sections for photoneutron production at 17 Mev, the cross section for photocapture by nuclei is deduced, and is found to be proportional to Z within 25 percent. Material is presented for the application of the compound nucleus formalism to light nuclei, in particular a formula for the density of levels.
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Heidmann et al. (1951) studied this question.
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