Abstract
THE possibility of producing elements with atomic numbers greater than 92 was discussed in 1934 by Fermi and his colleagues, who found that nearly all the elements undergo some transformation when bombarded with neutrons, and it was claimed that, among the products derived from uranium in this process, two at least, with half-life periods of 13 minutes and 90–100 minutes, must lie in the unknown range beyond uranium.
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Elements beyond Uranium. Nature 137, 958–959 (1936). https://doi.org/10.1038/137958a0
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DOI: https://doi.org/10.1038/137958a0