paper

Constraining the symmetry energy at subsaturation densities using isotope binding energy difference and neutron skin thickness

arXiv:1302.5327 · doi:10.1016/j.physletb.2013.08.002

Abstract

We show that the neutron skin thickness of heavy nuclei is uniquely fixed by the symmetry energy density slope at a subsaturation cross density fm rather than at saturation density , while the binding energy difference between a heavy isotope pair is essentially determined by the magnitude of the symmetry energy at the same . Furthermore, we find a value of leads to a negative - correlation while a value of leads to a positive one. Using data on of Sn isotopes and of a number of heavy isotope pairs, we obtain simultaneously MeV and MeV at 95% confidence level, whose extrapolation gives MeV and MeV. The implication of these new constraints on the of Pb and the core-crust transition density in neutron stars is discussed.

6 pages, 4 figures, 1 table. Discussions added. Accepted version to appear in PLB

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