Date of Original Version

3-2012

Type

Article

Rights Management

© 2012 American Physical Society

Abstract or Description

We report the first measurement of the parity-violating asymmetry APV in the elastic scattering of polarized electrons from Pb208. APV is sensitive to the radius of the neutron distribution (Rn). The result APV=0.656±0.060(stat)±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.

DOI

http://dx.doi.org/10.1103/PhysRevLett.108.112502

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Published In

Physical Review Letters, 108, 112502.