Asymmetric nuclear matter from an extended Brueckner-Hartree-Fock approach- art. no. 024605

The properties of isospin-asymmetric nuclear matter have been investigated in the framework of the extended Brueckner-Hartree-Fock approximation at ze ro temperature. Self-consistent calculations using the Argonne V-14 interac tion are reported for several values of the asymmetry parameter beta = (N - Z)/A, ranging from symmetric nuclear matter to pure neutron matter. The bi nding energy per nucleon fulfills the beta(2) law in the whole asymmetry ra nge. The symmetry energy is calculated for different densities and discusse d in comparison with other predictions, At the saturation point it is in fa irly good agreement with the empirical value. The present approximation, ba sed on the Landau definition of quasiparticle energy, is investigated in te rms of the Hugenholtz-Van Hove theorem, which is proved to be fulfilled wit h a good accuracy at various asymmetries. The isospin dependence of the sin gle-particle properties is discussed, including mean field, effective mass, and mean free path of neutrons and protons. The isospin effects in nuclear physics and nuclear astrophysics are briefly discussed. [S0556-2813(99)031 08-8].