The nuclear spectral function at high missing energies and momenta has been determined from a self-consistent calculation of the Green's function in nuclear matter using realistic nucleon-nucleon interactions. The results are compared with recent experimental data derived from (e, e ′ p) reactions on 12 C. A rather good agreement is obtained if the Green's functions are calculated in a non-perturbative way.
Properties of asymmetric nuclear matter are derived from various many-body
approaches. This includes phenomenological ones like the Skyrme Hartree-Fock
and relativistic mean field approaches, which are adjusted to fit properties of
nuclei, as well as more microscopic attempts like the Brueckner-Hartree-Fock
approximation, a self-consistent Greens function method and the so-called
$V_{lowk}$ approach, which are based on realistic nucleon-nucleon interactions
which reproduce the nucleon-nucleon phase shifts. These microscopic approaches
are supplemented by a density-dependent contact interaction to achieve the
empirical saturation property of symmetric nuclear matter. The predictions of
all these approaches are discussed for nuclear matter at high densities in
$\beta$-equilibrium. Special attention is paid to behavior of the isovector
component of the effective mass in neutron-rich matter.Comment: 16 pages, 7 figure
The self-energy of nucleons in asymmetric nuclear matter is evaluated
employing different realistic models for the nucleon-nucleon interaction.
Starting from the Brueckner Hartree Fock approximation without the usual
angle-average in the two-nucleon propagator the effects of the hole-hole
contributions are investigated within the self-consistent Green's function
approach. Special attention is paid to the isospin-dependence of correlations,
which can be deduced from the spectral functions of nucleons in asymmetric
matter. The strong components of the proton - neutron interaction lead in
neutron-rich matter to a larger depletion for the occupation probability of
proton states below the Fermi momentum.Comment: 11 pages, 5 figure
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