The present table contains experimental root-mean-square (rms) nuclear charge radii R obtained by combined analysis of two types of experimental data: (i) radii changes determined from optical and, to a lesser extent, K α X-ray isotope shifts and (ii) absolute radii measured by muonic spectra and electronic scattering experiments. The table combines the results of two working groups, using respectively two different methods of evaluation, published in ADNDT earlier. It presents an updated set of rms charge radii for 909 isotopes of 92 elements from 1 H to 96 Cm together, when available, with the radii changes from optical isotope shifts. Compared with the last published tables of R-values from 2004 (799 ground states), many new data are added due to progress recently achieved by laser spectroscopy up to early 2011. The radii changes in isotopic chains for He, Li, Be, Ne, Sc, Mn, Y, Nb, Bi have been first obtained in the last years and several isotopic sequences have been recently extended to regions far off stability, (

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This paper is devoted to the analysis of the general trends in the nucleon number dependence of the experimental root-mean-square (rms) charge radii. It is based on the data obtained by different methods of combined treatment of (i) radii changes determined from optical and—to a lesser extent—Kαx-ray isotope shifts, and (ii) absolute radii measured from muonic and electronic scattering experiments. These methods have recently been developed and now updated including experimental data up to the beginning of 2008. Thus, new sets of rms nuclear radii have been obtained covering 865 isotopes for 76 elements from 1H to 96Cm. New information on the isotopic and isotonic behaviour of the nuclear charge radius is obtained with a high accuracy compared to that of the directly measured radii values for the same element. Of special interest is that concerning the light elements and the appearance of non-traditional magic neutron and proton numbers, as N = 6, 14 and Z = 14; the double-magic properties of 96Zr are discussed in more detail. A quantitative criterion is introduced, which points to the peculiarities in the radii trend and offers an opportunity to investigate it more closely. The results provide important information which may serve as a guide to incorporate essential new features into the theoretical approaches.

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Empirical correlations between nuclear charge radii and several other experimental ground and excited state observables of even–even nuclei are presented for different regions in the nuclear chart. The correlation among the isotonic development of these observables around the classical magic proton numbers is considered starting from Z = 82 to lower magic Z. Special attention is paid to the structural evolution along the isotonic chains around the ‘traditional’ magic proton numbers 8 and 20. The remarkable correlations recognized there indicate shell structure changes and the appearance of new non-traditional single or double magic-like numbers, as Z = 6, 14, 16. The results add new information to the properties of light nuclei. As the mechanisms responsible for the modification of nuclear shell closures are still under discussion, the experimental information obtained is of crucial importance to better constrain the theoretical models. The effect of nuclear deformation on radii and their global correlation over the full mass number region is also investigated.