![]() ![]() The density in the cores of massive neutron stars is expected to be as large as ∼ 5 − 10 ρ 0 and in spite of decades of observations of neutron stars and intense theoretical studies, the structure of the matter in neutron star cores and in particular its equation of state remain the well-kept secret of neutron stars (for a recent review, see the book by Haensel, Potekhin and Yakovlev ). It corresponds to n 0 = 0.16 nucleons per fermi cubed. at the minimum of the energy per nucleon) has the density ρ 0 = 2.8 × 10 14 g cm −3, often called normal nuclear density. Analysis of nuclear masses tells us that nuclear matter at saturation (i.e. The simplest picture of the atomic nucleus is a drop of highly incompressible nuclear matter. Constructing models of neutron stars requires knowledge of the physics of matter with a density significantly exceeding the density of atomic nuclei. ![]()
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