Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn

Details Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn

2010-03-18

arxiv.org/abs/1003.3580v1

Phys.Rev.C81:041301,2010

Physics

Nuclear Physics

Nuclear Theory

Accepted for publication in PRC Rapid Comminication

Scientific paper

10.1103/PhysRevC.81.041301

Correlations between the behavior of the nuclear symmetry energy, the neutron skins, and the percentage of energy-weighted sum rule (EWSR) exhausted by the Pygmy Dipole Resonance (PDR) in 68Ni and 132Sn have been investigated by using different Random Phase Approximation (RPA) models for the dipole response, based on a representative set of Skyrme effective forces plus meson-exchange effective Lagrangians. A comparison with the experimental data has allowed us to constrain the value of the derivative of the symmetry energy at saturation. The neutron skin radius is deduced under this constraint.

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