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

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

2012-01-12

arxiv.org/abs/1201.2568v2

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

Physics

Nuclear Physics

Nuclear Experiment

6 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.108.112502

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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