IN studying photographic plates exposed to the cosmic rays, we have found a number of multiple disintegrations each of which appears to have been produced by the entry of a slow charged particle into a nucleus. Mosaics of photomicrographs of three of these events are given in Figs. 1, 2 and 3. The edges of the individual photographs have not been trimmed so that the components of the mosaics can be distinguished. Three grains of a track in Fig. 1, indicated by three arrows, which were out of focus in the original negatives, have been blackened with ink, but the photographs are otherwise completely unretouched.
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References
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Occhialini, G.P.S., Powell, C.F. NUCLEAR DISINTEGRATIONS PRODUCED BY SLOW CHARGED PARTICLES OF SMALL MASS. Nature 159, 186–190 (1947). https://doi.org/10.1038/159186a0
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DOI: https://doi.org/10.1038/159186a0
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