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Correlated one-body momentum density for helium to neon atoms

Starting from explicitly correlated wavefunctions, the one-body momentum density, (), and the expectation values () and pn, with n = -2 to +3, have been obtained for the atoms helium to neon. All the calculations have been carried out by using the Monte Carlo algorithm. An analysis of the numerical accuracy of the method has been performed within the Hartree-Fock framework. The effects of the electronic correlations have been systematically studied by comparing the correlated results with the corresponding Hartree-Fock ones.