Some Gamma-Rays Accompanying Artificial Nuclear Disintegrations

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Abstract
Gamma-rays have been observed from the bombardment of F, Li, and possibly B and Be by 1.15 m.e.v. protons, and gamma-rays and neutrons in varying proportions from the bombardment of Be, C, Li, B, and possibly F, Li, Mg and Al by 2.3 m.e.v. deutons. Studies have been made of the excitation function and of the absorption of some of these radiations, and also of the absorption of the "annihilation radiation" accompanying the radioactivity stimulated in carbon. The gamma-ray from fluorine bombarded by protons is of especial interest, since it furnishes an experimental check of the pair-production absorption at the high quantum energy of 5.4 m.e.v., where the pair-production accounts for more than half of the total absorption in lead.

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