In baryon- and neutron-rich matter the isospin symmetry energy drops substantially once a small fraction of antinucleons is included, with intrinsically larger isospin splitting for antinucleon potentials than for nucleon potentials.
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abstract
Properties of spin polarized isospin asymmetric nuclear matter are studied within the framework of the Brueckner--Hartree--Fock formalism. The single-particle potentials of neutrons and protons with spin up and down are determined for several values of the neutron and proton spin polarizations and the asymmetry parameter. It is found an almost linear and symmetric variation of the single-particle potentials as increasing these parameters. An analytic parametrization of the total energy per particle as a function of the asymmetry and spin polarizations is constructed. This parametrization is employed to compute the magnetic susceptibility of nuclear matter for several values of the asymmetry from neutron to symmetric matter. The results show no indication of a ferromagnetic transition at any density for any asymmetry of nuclear matter.
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A review of spin effects, superfluidity, and magnetic fields in neutron matter and their influence on neutron-star structure, superfluid phases, and rotational dynamics.
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Symmetry energy of baryon- and neutron-rich nuclear matter
In baryon- and neutron-rich matter the isospin symmetry energy drops substantially once a small fraction of antinucleons is included, with intrinsically larger isospin splitting for antinucleon potentials than for nucleon potentials.
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Spin effects in superfluidity, neutron matter and neutron stars
A review of spin effects, superfluidity, and magnetic fields in neutron matter and their influence on neutron-star structure, superfluid phases, and rotational dynamics.