Impact of the symmetry energy on the outer crust of non-accreting neutron stars

Details Impact of the symmetry energy on the outer crust of non-accreting neutron stars Impact of the symmetry energy on the outer crust of non-accreting neutron stars

2008-05-16

arxiv.org/abs/0805.2553v1

Phys.Rev.C78:025807,2008

Physics

Nuclear Physics

Nuclear Theory

21 pages, 8 figures, submitted to Physical Review C

Scientific paper

10.1103/PhysRevC.78.025807

The composition and equation of state of the outer crust of non-accreting neutron stars is computed using accurate nuclear mass tables. The main goal of the present study is to understand the impact of the symmetry energy on the structure of the outer crust. First, a simple "toy model" is developed to illustrate the competition between the electronic density and the symmetry energy. Then, realistic mass tables are used to show that models with a stiff symmetry energy - those that generate large neutron skins for heavy nuclei - predict a sequence of nuclei that are more neutron-rich than their softer counterparts. This result may be phrased in the form of a correlation: the larger the neutron skin of 208Pb, the more exotic the composition of the outer crust.

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