Properties of low-density neutron-star matter
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A nuclear Thomas-Fermi model is used to determine the ground state of matter at subnuclear densities allowing for inhomogeneities on a nuclear scale ("clusters"). The "neutron drip" phase transition occurs at 3.7 × 1011 g/cm3. As a function of the average density the proton number Z of the clusters first increases from Z29 at 1.4 × 108 g/cm3 to a maximum of Z35 at ∼3.0 × 1012 g/cm3 and then decreases until the clusters gradually evanesce just above 1014 g/cm3; this transition is smooth.
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Physical Review Letters