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Measurement of the neutron radius of 208Pb through parity violation in electron scattering |
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| Authors: | Abrahamyan S Ahmed Z Albataineh H Aniol K Armstrong D S Armstrong W Averett T Babineau B Barbieri A Bellini V Beminiwattha R Benesch J Benmokhtar F Bielarski T Boeglin W Camsonne A Canan M Carter P Cates G D Chen C Chen J-P Hen O Cusanno F Dalton M M De Leo R de Jager K Deconinck W Decowski P Deng X Deur A Dutta D Etile A Flay D Franklin G B Friend M Frullani S Fuchey E Garibaldi F Gasser E Gilman R Giusa A Glamazdin A Gomez J Grames J Gu C Hansen O Hansknecht J Higinbotham D W Holmes R S Holmstrom T Horowitz C J Hoskins J Huang J Hyde C E Itard F Jen C-M Jensen E Jin G Johnston S Kelleher A |
| Affiliation: | Yerevan Physics Institute, Yerevan, Armenia. |
| Abstract: | 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 (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)(+0.16) fm and provides the first electroweak observation of the neutron skin which is expected in a heavy, neutron-rich nucleus. |
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