Abstract
CONSIDERATION of nuclear systematics shows that, if any stable isotope of promethium exists, it would almost certainly have a mass number 145, 147 or 149, or possibly 143 with the stable 82-neutron configuration. It is, however, already known1,2 that the isotopes 147, 149 and 143 have half-lives of about four years, 47 hr. and 350 days respectively. It is therefore of interest to investigate whether the unknown promethium-145 is radioactive.
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BUTEMENT, F. Radioactive Samarium-145 and Promethium-145. Nature 167, 400 (1951). https://doi.org/10.1038/167400a0
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DOI: https://doi.org/10.1038/167400a0
