Complete electric dipole response and the neutron skin in 208Pb

Details Complete electric dipole response and the neutron skin in 208Pb Complete electric dipole response and the neutron skin in 208Pb

2011-04-28

arxiv.org/abs/1104.5431v2

Phys.Rev.Lett.107:062502,2011

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 5 figures, revised mansucript

Scientific paper

10.1103/PhysRevLett.107.062502

A benchmark experiment on 208Pb shows that polarized proton inelastic scattering at very forward angles including 0{\deg} 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+0.025-0.021 fm in 208Pb 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.

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