We report the first measurement of the parity-violating asymmetry A_PV in the
elastic scattering of polarized electrons from 208Pb. A_PV is sensitive to the
radius of the neutron distribution (Rn). The result A_PV = 0.656 pm 0.060
(stat) pm 0.013 (syst) corresponds to a difference between the radii of the
neutron and proton distributions Rn - Rp = 0.33 +0.16 -0.18 fm and provides the
first electroweak observation of the neutron skin which is expected in a heavy,
neutron-rich nucleus.
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