Abstract
SEVERAL investigators have reported finding positive particles emitted from β-emitters1–8, in numbers very much greater than allowed by the theory of pair production either by γ-rays or β-particles. In some cases positive particles have been found to the extent of 1 per cent of the β-radiations from substances which are not γ-emitters4,7, and in others positive particles of surprisingly high energy have been detected7.
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MCCUSKER, C. Apparent Emission of Positive Electrons from β-Emitters. Nature 161, 564–565 (1948). https://doi.org/10.1038/161564a0
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DOI: https://doi.org/10.1038/161564a0
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