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arxiv: 1201.2568 · v2 · submitted 2012-01-12 · ⚛️ nucl-ex

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Measurement of the Neutron Radius of 208Pb Through Parity-Violation in Electron Scattering

S. Abrahamyan , Z. Ahmed , H. Albataineh , K. Aniol , D. S. Armstrong , W. Armstrong , T. Averett , B. Babineau
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keywords neutronfirstmeasurementradiusscatteringasymmetrycorrespondsdifference
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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 0.014 (syst) ppm 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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