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Laboratory experiments sensitive to the equation of state of neutron richmatter in the vicinity of nuclear saturation density provide the first rung ina "density ladder" that connects terrestrial experiments to astronomicalobservations. In this context, the neutron skin thickness of 208Pb (Rskin)provides a stringent laboratory constraint on the density dependence of thesymmetry energy. In turn, an improved value of Rskin has been reported recentlyby the PREX collaboration. Exploiting the strong correlation between Rskin andthe slope of the symmetry energy L within a specific class of relativisticenergy density functionals, we report a value of L=(106 +/- 37)MeV -- thatsystematically overestimates current limits based on both theoreticalapproaches and experimental measurements. The impact of such a stiff symmetryenergy on some critical neutron-star observables is also examined.

Implications of PREX-II on the equation of state of neutron-rich matter