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

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arxiv 1201.2568 v2 pith:GWEYDZII submitted 2012-01-12 nucl-ex

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

S. Abrahamyan , Z. Ahmed , H. Albataineh , K. Aniol , D. S. Armstrong , W. Armstrong , T. Averett , B. Babineau
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A. Barbieri V. Bellini R. Beminiwattha J. Benesch F. Benmokhtar T. Bielarski W. Boeglin A. Camsonne M. Canan P. Carter G. D. Cates C. Chen J.-P. Chen O. Hen F. Cusanno M. M. Dalton R. De Leo K. de Jager W. Deconinck P. Decowski X. Deng A. Deur D. Dutta A. Etile D. Flay G. B. Franklin M. Friend S. Frullani E. Fuchey F. Garibaldi E. Gasser R. Gilman A. Giusa A. Glamazdin J. Gomez J. Grames C. Gu O. Hansen J. Hansknecht D. W. Higinbotham R. S. Holmes T. Holmstrom C. J. Horowitz J. Hoskins J. Huang C. E. Hyde F. Itard C.-M. Jen E. Jensen G. Jin S. Johnston A. Kelleher K. Kliakhandler P.M. King S. Kowalski K. S. Kumar J. Leacock J. Leckey IV J. H. Lee J. J. LeRose R. Lindgren N. Liyanage N. Lubinsky J. Mammei F. Mammoliti D.J. Margaziotis P. Markowitz A. McCreary D. McNulty L. Mercado Z.-E. Meziani R. W. Michaels M. Mihovilovic N. Muangma C. Mu\~noz-Camacho S. Nanda V. Nelyubin N. Nuruzzaman Y. Oh A. Palmer D. Parno K. D. Paschke S. K. Phillips B. Poelker R. Pomatsalyuk M. Posik A.J.R. Puckett B. Quinn A. Rakhman P. E. Reimer S. Riordan P. Rogan G. Ron G. Russo K. Saenboonruang A. Saha B. Sawatzky A. Shahinyan R. Silwal S. Sirca K. Slifer P. Solvignon P. A. Souder M. L. Sperduto R. Subedi R. Suleiman V. Sulkosky C. M. Sutera W. A. Tobias W. Troth G. M. Urciuoli B. Waidyawansa D. Wang J. Wexler R. Wilson B. Wojtsekhowski X. Yan H. Yao Y. Ye Z. Ye V. Yim L. Zana X. Zhan J. Zhang Y. Zhang X. Zheng P. Zhu
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keywords neutronfirstmeasurementradiusscatteringasymmetrycorrespondsdifference
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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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Cited by 2 Pith papers

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  1. Ab initio calculations of parity-violating electron scattering off $^{48}$Ca and $^{208}$Pb

    nucl-th 2026-06 unverdicted novelty 8.0

    Ab initio chiral EFT calculations of parity-violating asymmetries for 48Ca and 208Pb show mild tension with data and infer a neutron skin of 0.187(25)(18) fm for 208Pb.

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    High-statistics CEνNS measurements at J-PARC are feasible with significant sensitivity to relevant particle physics scenarios using currently funded detectors.