Electric dipole response of 208Pb from proton inelastic scattering: constraints on neutron skin thickness and symmetry energy

Abstract

The electric dipole (E1) response of 208Pb has been precisely determined by measuring Coulomb excitation induced by proton scattering at very forward angles. The electric dipole polarizability, defined as inverse energy-weighted sum rule of the E1 strength, has been extracted as 20.1+-0.6 fm^3. The data can be used to constrain the neutron skin thickness of 208Pb to 0.168(+-0.009)_expt(+-0.013)_theo(+-0.021)_est fm, where the subscript "expt" refers to the experimental uncertainty, "theor" to the theoretical confidence band and "est" to the uncertainty associated with the estimation of the symmetry energy at the saturation density. In addition, a constraint band has been extracted in the plane of the symmetry energy (J) and its slope parameter (L) at the saturation density.

6 pages, 8 figures, revised manuscript submitted to special volume of Eur. Phys. J. A on symmetry energy

References in corpus (7)

• Neutron Star Observations: Prognosis for Equation of State Constraints
• The Nuclear Equation of State and Neutron Star Masses
• Neutron skin of 208Pb, nuclear symmetry energy, and the parity radius experiment
• Neutron matter at next-to-next-to-next-to-leading order in chiral effective field theory
• Constraints on neutron star radii based on chiral effective field theory interactions
• Electric Dipole Polarizability in ${}^{208}$Pb: insights from the Droplet Model
• Neutron density distributions from antiprotonic 208Pb and 209Bi atoms

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