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Measurement of the neutron radius of Pb208 through parity violation in electron scattering
Abrahamyan, S Ahmed, Z Albataineh, H Aniol, K Armstrong, DS Armstrong, W Averett, T Babineau, B Barbieri, A Bellini, V
Abrahamyan, S
Ahmed, Z
Albataineh, H
Aniol, K
Armstrong, DS
Armstrong, W
Averett, T
Babineau, B
Barbieri, A
Bellini, V
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2012-03-15
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10.1103/PhysRevLett.108.112502
Abstract
We report the first measurement of the parity-violating asymmetry A PV in the elastic scattering of polarized electrons from Pb208. A PV is sensitive to the radius of the neutron distribution (R n). The result A PV=0.656±0.060(stat)±0. 014(syst)ppm corresponds to a difference between the radii of the neutron and proton distributions R n-R p=0.33-0.18+0.16fm and provides the first electroweak observation of the neutron skin which is expected in a heavy, neutron-rich nucleus. © 2012 American Physical Society.
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Physical Review Letters
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