Document Type

Article

Publication Date

3-15-2012

Abstract

We report the first measurement of the parity-violating asymmetry APV in the elastic scattering of polarized electrons from 208Pb. 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=0.33-0.18+0.16  fm and provides the first electroweak observation of the neutron skin which is expected in a heavy, neutron-rich nucleus.

DOI

10.1103/PhysRevLett.108.112502

Version

Publisher's PDF

Comments

© 2012 American Physical Society. The original publication is available at http://link.aps.org/doi/10.1103/PhysRevLett.108.112502

Original Citation

Phys. Rev. Lett. 108, 112502 (2012)

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