Measurement in ordinary hydrogen agrees with a surprising 2010 result on the element's exotic cousin — but gives a smaller value than virtually every other experiment.
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Pohl, R. et al. Nature 466, 213–216 (2010).
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Castelvecchi, D. Proton-size puzzle deepens. Nature (2017). https://doi.org/10.1038/nature.2017.22760
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DOI: https://doi.org/10.1038/nature.2017.22760
