Abstract
THE artificial production of radioactive isotopes recently discovered1 has to be brought into connexion with the theoretical treatment of the type of radioactive transformation2. It is easily seen that the formulæ given for the (β-decay of heavy elements apply to the emission of positive electrons by simply changing the sign of the charges involved. We have calculated the continuous energy spectra to be expected from N13 both according to the theory developed some time ago by ourselves and according to the assumption that a so-called ‘neutrino’ is emitted simultaneously with the electron. The curves obtained in this way are very similar and may be represented by Fig. 1, which has been drawn for a special case. It seems to us that it will be scarcely possible to distinguish between these two theories by measuring the shape of the energy spectrum.
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References
I. Curie and F. Joliot, C.R. Acad. Sci., 198, 254; 1934. J. D. Cockroft, C. W. Gilbert and E. T. S. Walton, NATURE, 133, 328, March 3, 1934.
G. Beck and K. Sitte, Z. Phys., 86, 105 ; 1933. E. Fermi, La Ricerca Scientifica, 2, No. 12.
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BECK, G., SITTE, K. β-Emission of Positive Electrons. Nature 133, 722 (1934). https://doi.org/10.1038/133722a0
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DOI: https://doi.org/10.1038/133722a0
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