Energies of muonic X-rays of the K-series of carbon, nitrogen and oxygen have been measured with an accuracy of about 15 eV. Root mean square radii of the nuclear charge distributions were deduced. The results 2.49±0.05 fm for carbon, 2.55 ±0.03 fm for nitrogen and 2.71 ±0.02 fm for oxygen are in good agreement at comparable accuracy with recent electron scattering data.NUCLEAR REACTIONS muonic atoms 12C, 14N, 160, 103Rh(u,2nv)101Ru; E E approx 0; measured muonic X-rays, E"I' 12C, 14N, 16 0 deduced nuclear charge radius, 101Ru deduced transitions.

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