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We study the nuclear ground-state properties by using theunitary-model-operator approach (UMOA). Recently, the particle-basis formalismhas been introduced in the UMOA and enables us to employ the charge-dependentnucleon-nucleon interaction. We evaluate the ground-state energies and chargeradii of $^{4}$He, $^{16}$O, $^{40}$Ca, and $^{56}$Ni with the charge-dependentBonn potential. The ground-state energy is dominated by the contributions fromthe one- and two-body cluster terms, while, for the radius, theone-particle-one-hole excitations are more important than thetwo-particle-two-hole excitations. The calculated results reproduce the trendof experimental data of the saturation property for finite nuclei.

Ground-state energies and charge radii of $^{4}$He, $^{16}$O, $^{40}$Ca, and $^{56}$Ni in the unitary-model-operator approach