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 Ni-68 and Sn-132 are 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.
Constraints on the symmetry energy and neutron skins from pygmy resonances in Ni-68 and Sn-132 / A. Carbone, G. Colo', A. Bracco, L. G. Cao, P. F. Bortignon, F. Camera, O. Wieland. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 81:4(2010 Apr), pp. 041301.041301.1-041301.041301.5. [10.1103/PhysRevC.81.041301]
Constraints on the symmetry energy and neutron skins from pygmy resonances in Ni-68 and Sn-132
G. Colo'Secondo
;A. Bracco;P.F. Bortignon;F. CameraPenultimo
;
2010
Abstract
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 Ni-68 and Sn-132 are 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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