  We present microscopic calculations of light and medium mass nuclei and the
equation of state of symmetric and asymmetric nuclear matter using different
nucleon-nucleon forces, including a new Argonne version that has the same
spin/isospin structure as local chiral forces at next-to-next-to-leading order
(N2LO). The calculations are performed using Auxiliary Field Diffusion Monte
Carlo (AFDMC) combined with an improved variational wave function. We show that
the AFDMC method can now be used to successfully calculate the energies of very
light to medium mass nuclei as well as the energy of isospin-asymmetric nuclear
matter, demonstrating microscopically the quadratic dependence of the energy on
the symmetry energy.
