Nuclear symmetry energy probed by neutron skin thickness of nuclei

X.Viņas, M. Centelles, X. Roca-Maza and M. Warda

We describe a relation between the symmetry energy coefficients
of finite nuclei and c_sym(rho) of nuclear matter that
accomodates other correlations of structure observables with the
low-density behavior of c_sym(rho). Here we apply it to explore the
prospects of systematic measurements of neutron skin sizes across the
mass table for constraining c_sym(rho), using present data from
antiprotonic atoms. The results from skins are in accord with the
recent constraints from reactions and giant resonances, though lie on
the edge of a softer symmetry energy.