ALPHA PARTICLES FROM THE PHOTODISINTEGRATION OF SILVER AND BROMINE

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Abstract
Ilford E1 nuclear emulsions were exposed behind 4 cm. of lucite to the X-ray beam of the University of Saskatchewan betatron operating at energies from 12 Mev. to 26.6 Mev. They were developed by a "grain-gradation" process in order to suppress proton tracks and γ-ray fog. The variation in yield with energy of the double-peaked single α-particle energy spectrum resulting from the photodisintegration of silver and bromine was studied. Preliminary results are given concerning the cross-section curves corresponding to various portions of this α-particle spectrum. The energy distributions and cross-section curves have been interpreted in terms of the statistical theory of nuclear reactions.

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