Abstract
IN a letter to NATURE1, we reported some time ago that we had obtained evidence for the expulsion of two neutrons from the nucleus when copper and zinc were bombarded with the fast neutrons from a (Li + 2H) source. In the case of copper, our assumption was confirmed by the experiments of Bothe and Gentner2, who obtained the same radioactive copper nucleus by irradiating this element with gamma rays, this giving rise to the expulsion of a neutron. According to the latter process the same investigators produced some new radioactive bodies. We attempted to get the same active isotopes with the fast neutrons from our (Li + H2) source according to the process (n, 2n), the results being as follows.
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Heyn, F. A., NATURE, 138, 723 (1936).
Bothe, W., and Gentner, W., Naturwiss., 25, 90, 126, 191 (1937).
McLennan, J., Grimmet, G., and Read, J., NATURE, 135, 505 (1935).
Fermi and others, Proc. Roy. Soc., A., 149, 522 (1935).
Preiswerk, P., and von Halban, H., Comptes rendus, 201, 722 (1935).
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HEYN, F. Radioactivity induced by Fast Neutrons according to the (n, 2n) Reaction. Nature 139, 842 (1937). https://doi.org/10.1038/139842a0
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DOI: https://doi.org/10.1038/139842a0
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