title: Complete electric dipole response and the neutron skin in 208Pb.
abstract: A benchmark experiment on (208)Pb shows that polarized proton inelastic scattering at very forward angles including 0° is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic dipole (M1) modes in nuclei over a broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads to a neutron skin thickness r(skin) = 0.156(-0.021)(+0.025) fm in (208)Pb derived within a mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry energy and its density dependence relevant to the description of neutron stars.
authors: Research Center for Nuclear Physics, Osaka University, Ibaraki, Japan.
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authors: Tamii
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authors: Poltoratska
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authors: von Neumann-Cosel
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authors: Fujita
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authors: Matsubara
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authors: Nakanishi
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authors: Neveling
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authors: Okamura
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