Nuclear Symmetry Energy: constraints from Giant Quadrupole Resonances and Parity Violating Electron Scattering

TL;DR

This paper investigates nuclear symmetry energy through experimental and theoretical analysis of giant quadrupole resonances and parity-violating electron scattering, providing new insights into the density dependence of the symmetry energy.

Contribution

It offers new measurements and theoretical insights linking giant quadrupole resonances and parity-violating scattering to the nuclear symmetry energy.

Findings

Excitation energy and polarizability of IVGQR analyzed.

Parity violating asymmetry related to symmetry energy density dependence.

Experimental results support theoretical models of nuclear symmetry energy.

Abstract

Experimental and theoretical efforts are being devoted to the study of observables that can shed light on the properties of the nuclear symmetry energy. We present our new results on the excitation energy [X. Roca-Maza et al., Phys. Rev. C 87, 034301 (2013)] and polarizability of the Isovector Giant Quadrupole Resonance (IVGQR), which has been the object of new experimental investigation [S. S. Henshaw et al., Phys. Rev. Lett. 107, 222501 (2011)]. We also present our theoretical analysis on the parity violating asymmetry at the kinematics of the Lead Radius Experiment [S. Abrahamyan et al. (PREx Collaboration), Phys. Rev. Lett. 108, 112502 (2012)] and highlight its relation with the density dependence of the symmetry energy [X. Roca-Maza et al., Phys. Rev. Lett. 106, 252501 (2011)].