Compilation of recent nuclear ground state charge radius measurements and tests for models

The root-mean-square (rms) charge radii of 236 nuclides measured by laser spectroscopy experiment are compiled, and the uncertainties are calculated. From the rms charge radii of Mg isotope chain, the new magic number N = 14 can be observed, and the traditional magic number N = 20 disappears in the K isotope chain. A good linear relationship between the difference of the mirror nuclear charge radii and the isospin asymmetry can be clearly observed with a Pearson's linear correlation coefficient of 0.96. The accuracies and predictive powers of the WS* and HFB25 models are tested with these new data. The rms deviation with the WS* model is only 0.0176 fm for the 129 new data, which is much better than that of HFB25 model. The influence of deformation effect on nuclear charge radius prediction is studied systematically. (C) 2021 Elsevier Inc. All rights reserved.

Automated summary

New data from laser spectroscopy experiments reveal the emergence of a new magic number N = 14 in the Mg and K isotope chains, while the traditional magic number N = 20 disappears. A strong linear relationship between the difference in mirror nuclear charge radii and isospin asymmetry is observed. The WS* model demonstrates higher accuracy in predicting nuclear charge radii compared to the HFB25 model.