Symmetry energy at subnuclear densities deduced from nuclear masses

Details Symmetry energy at subnuclear densities deduced from nuclear masses Symmetry energy at subnuclear densities deduced from nuclear masses

2010-02-23

arxiv.org/abs/1002.4325v2

Phys.Rev.C81:054302,2010

Physics

Nuclear Physics

Nuclear Theory

8 pages, 5 figures; Sec. II expanded

Scientific paper

10.1103/PhysRevC.81.054302

We examine how nuclear masses are related to the density dependence of the symmetry energy. Using a macroscopic nuclear model we calculate nuclear masses in a way dependent on the equation of state of asymmetric nuclear matter. We find by comparison with empirical two-proton separation energies that a smaller symmetry energy at subnuclear densities, corresponding to a larger density symmetry coefficient L, is favored. This tendency, which is clearly seen for nuclei that are neutron-rich, nondeformed, and light, can be understood from the property of the surface symmetry energy in a compressible liquid-drop picture.

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