Abstract
I. CURIE, F. Joliot and P. Preiswerk1 observed that after bombarding silicon or phosphorus by neutrons, the artificially produced radioactive nuclei emitted: (1) negative electrons as previously observed by Fermi2; (2) rays of high energy (5 × 106 e.v.); (3) positrons (which they tentatively suggest to be due to the creation of pairs by the rays, an explanation which does not seem very probable as they state that the positrons have an upper energy limit of 1 × 106 e.v. only); and (4) neutrons. They assume that some of the radioactive nuclei are 13Al28 and 14Si31, and that the spontaneously emitted neutrons are due to the transformation processes:
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References
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GOLDHABER, M. Spontaneous Emission of Neutrons by Artificially Produced Radioactive Bodies. Nature 134, 25 (1934). https://doi.org/10.1038/134025a0
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DOI: https://doi.org/10.1038/134025a0
