The neutron–proton mass difference, one of the most consequential parameters of physics, has now been calculated from fundamental theories. This landmark calculation portends revolutionary progress in nuclear physics.
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Wilczek, F. A weighty mass difference. Nature 520, 303–304 (2015). https://doi.org/10.1038/nature14381
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DOI: https://doi.org/10.1038/nature14381
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