Symmetry energy properties in bulk nuclear matter estimated from neutron skin thickness in finite nuclei.

Description
n the first part of the seminar a relation between symmetry energy coefficients C in nuclear matter and in finite nuclei A. We take advantage of this relationship to explore the constraints on C provided by a large set of measurements of the neutron skin thickness in finite nuclei using antiprtonoc atoms. The constraints found on the density slope of the symmetry energy at saturation are in good ageement with other estimates that use different observables in their analysis. In the second part we discuss, in mean field approximation,the relation between the neutron radius and polarized electron scattering results in 208Pb in a context similar to the one of the parity radius experiment (PREX). It is found that the highly linear correlation between the parity-violating asymmetry A_pv (which is the quantity measured in real experiments) and the neutron skin thickness Dr_np is the best way to constrain this quantity in 208Pb without any assumption on the neutron density profile. The present study shows that this observable A_pv could constrain the density slope of the symmetry energy to 10 MeV if the experimental error in its measurement is pushed to 1% .
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Organised by Marcello Baldo