Quantum Monte Carlo Calculation for the neutron-rich Ca isotopes

We computed ground-state energies of calcium isotopes from Ca to Ca by means of the Auxiliary Field Diffusion Monte Carlo (AFDMC) method. Calculations were performed by replacing the Ca core with a mean-field self consistent potential computed using Skyrme interaction. The energy of the external neutrons is calculated by projecting the ground-state from a wave function built with the single particle orbitals computed in the self consistent external potential. The shells considered were the 1F7/2 and the 1F5/2. The Hamiltonian employed is semi-realistic and includes tensor, spin–orbit and three–body forces. While absolute binding energies are too deep if compared with experimental data, the differences between the energies for nearly all isotopes are in very good agreement with the experimental data. PACS. 21.10.-k Properties of nuclei; nuclear energy levels – 21.10.Dr Binding energies and masses – 24.10.Cn Many-body theory – 21.30.Fe Forces in hadronic systems and effective interactions