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 \( \alpha_{D}=20.1\pm 0.6\) fm3. The data can be used to constrain the neutron skin thickness of 208Pb to \( \Delta r_{np}=0.165\pm (0.009)_{expt}\pm (0.013)_{theor} \pm (0.021)_{est}\) 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.
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Communicated by A. Ramos
Contribution to the Topical Issue “Nuclear Symmetry Energy” edited by Bao-An Li, Àngels Ramos, Giuseppe Verde, Isaac Vidaña.
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Tamii, A., von Neumann-Cosel, P. & Poltoratska, I. Electric dipole response of 208Pb from proton inelastic scattering: Constraints on neutron skin thickness and symmetry energy. Eur. Phys. J. A 50, 28 (2014). https://doi.org/10.1140/epja/i2014-14028-7
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DOI: https://doi.org/10.1140/epja/i2014-14028-7