A frequency-comb-referenced laser measurement of the 13C4+ hyperfine spectrum yields Rc(13C) = 2.4464(45) fm, six times more precise than electron scattering and in tension with the muonic-atom value.
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The nuclear charge radius of $^{13}\mathrm{C}$
A frequency-comb-referenced laser measurement of the 13C4+ hyperfine spectrum yields Rc(13C) = 2.4464(45) fm, six times more precise than electron scattering and in tension with the muonic-atom value.