UNTIL recently it was generally admitted that an atom resulting from artificial disintegration should normally correspond to a stable isotope. M. and Mme. Joliot first found evidence that it is not necessarily so; in some cases the product atom may be radioactive with a measurable mean life, and go over to a stable form only after emission of a positron.
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FERMI, P. Possible Production of Elements of Atomic Number Higher than 92. Nature 133, 898–899 (1934). https://doi.org/10.1038/133898a0