Complete electric dipole response and the neutron skin in 208Pb
  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. 
A. Tamii (1), I. Poltoratska (2), P. von Neumann-Cosel (2), Y. Fujita   (3), T. Adachi (3,4), C. A. Bertulani (5), J. Carter...
nucl-ex nucl-th