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Quantum electrodynamics

Hyperfine puzzle?

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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Correspondence to Jean-Philippe Karr.

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Karr, JP. Hyperfine puzzle?. Nature Phys 13, 533–534 (2017). https://doi.org/10.1038/nphys4159

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