A measurement of the size of the proton, obtained using spectroscopy of an exotic atomic system, yields a result of unprecedented accuracy — but in disagreement with values obtained by previous methods.
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F. REISER & A. ANTOGNINI, PAUL-SCHERRER-INST.
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Flowers, J. A chink in the armour?. Nature 466, 195–196 (2010). https://doi.org/10.1038/466195a
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DOI: https://doi.org/10.1038/466195a
