Nuclei with a 'magic' number of both protons and neutrons, dubbed doubly magic, are particularly stable. The oxygen isotope 24O has been found to be one such nucleus — yet it lies just at the limit of stability.
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Janssens, R. Unexpected doubly magic nucleus. Nature 459, 1069–1070 (2009). https://doi.org/10.1038/4591069a
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DOI: https://doi.org/10.1038/4591069a
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