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Relativistic and QED corrections were calculated for hyperfine splitting ofthe $2S_{1/2}$ ground state in $^{6,7}$Li atoms with an exact account forelectronic correlations. The resulting theoretical predictions achieved such aprecision level that, by comparison with experimental values, they enabledetermination of the nuclear properties. In particular, the obtained resultsshow that the $^7$Li nucleus, having a charge radius smaller than $^6$Li, hasabout a 40% larger Zemach radius. Together with known differences in theelectric quadrupole and magnetic dipole moments, this calls for a deeperunderstanding of the Li nuclear structure.

Ground state hyperfine splitting in ^6,7Li atoms and the nuclear structure