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The ground-state properties of neutron-rich exotic Na and Mg isotopes witheven numbers of neutrons, N, are studied up to driplines. The shell-modelcalculations with an ab initio effective nucleon-nucleon interaction reportedin [Tsunoda, Otsuka, Takayanagi et al., Nature 587, 66 (2020)] are extended toobservables such as magnetic dipole and electric quadrupole moments, and chargeand matter radii. Good agreements with experimental data are found, andpredictions are shown up to driplines. A prescription to extract thedeformation parameters for the eigenstates of Monte Carlo Shell Model ispresented, and the obtained values are used to calculate charge and matterradii. The increase of these radii from the Droplet model is described as theconsequences of the varying deformation of the surface and the growing neutronexcitations or occupations in the pf shell, consistently with the driplinemechanism presented in the above reference. The neutron skin thickness is shownto be about 0.1 fm for N=20, which can be compared to the value for 208Pb in anA1/3 scaling. The relation of the neutron skin thickness to the electromagneticmoments is discussed for an exotic nucleus, 31Na.

Moments and Radii of exotic Na and Mg isotopes