Improved-accuracy measurements of the ground-state hyperfine splitting in highly charged bismuth ions reveal a surprising discrepancy with the predictions of quantum electrodynamics.
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Karr, JP. Hyperfine puzzle?. Nature Phys 13, 533–534 (2017). https://doi.org/10.1038/nphys4159
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DOI: https://doi.org/10.1038/nphys4159