The tracks of the particles which result from the disintegration of boron by neutrons have been recorded by impregnating the emulsion of a photographic plate with borax. It is shown that there are two modes of disintegration, corresponding to the reactions: B 10 + n 1 → Li 7 + He 4 , B 10 + n 1 → He 4 + He 4 + H 3 . Photomicrographs of the tracks, showing both modes of disintegration, are reproduced.
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H. J. Taylor (1935) studied this question.
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