Constraints on the symmetry energy and on neutron skins from the pygmy resonances in 68Ni and 132Sn
Andrea Carbone,Gianluca Colò,A. Bracco,Li-Gang Cao,Pier Francesco Bortignon,F. Camera,Oliver Wieland +6 more
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TLDR
In this paper, the relationship between the nuclear symmetry energy, the neutron skins, and the percentage of energy-weighted sum rule (EWSR) exhausted by the pygmy dipole resonance was investigated by using different random phase approximation (RPA) models based on a representative set of Skyrme effective forces plus meson exchange effective Lagrangians.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 $^{68}\mathrm{Ni}$ and $^{132}\mathrm{Sn}$ 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.read more
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The Nuclear Equation of State and Neutron Star Masses
TL;DR: In this article, an ensemble of mass and radius observations can realistically restrict the properties of dense matter and, in particular, the behavior of the nuclear symmetry energy near the nuclear saturation density.
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Experimental studies of the Pygmy Dipole Resonance
TL;DR: A review about the present status of experimental approaches to study low-lying electric dipole strength (often denoted as Pygmy Dipole Resonance) in stable and radioactive atomic nuclei can be found in this paper.
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Neutron skin of (208)Pb, nuclear symmetry energy, and the parity radius experiment.
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