Measurement Of The Neutron Radius Of Pb-208 Through Parity Violation In Electron Scattering

S. L. Abrahamyan,Zafar A. Ahmed,H. Albataineh,K. A. Aniol,David S. Armstrong,William J. Armstrong,Todd D. Averett,B. Babineau,A. Barbieri,Vincenzo Bellini,Rakitha S. Beminiwattha,J. F. Benesch,Fatiha Benmokhtar,T. Bielarski,Werner U. Boeglin,A. Camsonne,M. Canan,Paul A. Carter,Gordon D. Cates,Chinhao Chen,Jianping Chen,Or Hen,Francesco Cusanno,Mark M. Dalton,Raffaele De Leo,Kees De Jager,Wouter Deconinck,Piotr Decowski,Xiaoyan Deng,Alexandre P. Deur,Dipangkar Dutta,A. Etile,D. Flay,G. B. Franklin,M. Friend,Salvatore Frullani,E. Fuchey,Franco Garibaldi,E. Gasser,Ronald Gilman,A. Giusa,A. V. Glamazdin,John Alexis Guerra Gömez,Joseph M. Grames,C. Gu,Ole Per Hansen,John C. Hansknecht,Douglas W. Higinbotham,Richard S. Holmes,Timothy K. Holmstrom,Charles J. Horowitz,J. Hoskins,Jin Huang,Charles E. Hyde,F. Itard,C. M. Jen,Eric R. Jensen,Guoqiang Jin,Steven J. Johnston,A. M. Kelleher,Kostantin Kliakhandler,Pauline M. King,Stanley Kowalski,Krishna Siva Kumar,John Leacock,John P. Leckey,Jeonghan Lee,John J. Lerose,R. A. Lindgren,Nilanga Liyanage,N. Lubinsky,Juliette M. Mammei,F. Mammoliti,Demetrius J. Margaziotis,P. E C Markowitz,A. McCreary,Daniel E. McNulty,L. Mercado,Zein Eddine Méziani,Robert W. Michaels,M. Mihovilovič,N. Muangma,C. Muñoz-Camacho,Sirish K. Nanda,V. V. Nelyubin,N. Nuruzzaman,Youngtaek Oh,Antony S C Palmer,D. S. Parno,Kent D. Paschke,S. K. Phillips,B. M. Poelker,Roman I. Pomatsalyuk,M. Posik,Andrew J R Puckett,Brian P. Quinn,Abdurahim Rakhman,Paul E. Reimer,S. Riordan,P. Rogan,Gila Ron,Giovanni Valerio Russo,K. Saenboonruang,Arun Saha,B. D. Sawatzky,A. R. Shahinyan,Rupesh Silwal,S. Sirca,Karl Slifer,Patricia H. Solvignon,Paul A. Souder,Maria Leda Sperduto,Ramesh R. Subedi,Raid M. Suleiman,Vincent A. Sulkosky,C. Sütera,William A. Tobias,W. Troth,G. Maria Urciuoli,Buddhini P. Waidyawansa,D. Wang,J. Wexler,Richard J. Wilson,Bogdan B. Wojtsekhowski,Xinhu Yan,Huan Yao,Yunxiu Ye,Z. G. Ye,V. Yim,L. Zana,Xiaohui Zhan,Jun Zhang,Yan Zhang,Xiaoguang Zheng,PengJia Zhu

PHYSICAL REVIEW LETTERS（2012）

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摘要

We report the first measurement of the parity-violating asymmetry A(PV) in the elastic scattering of polarized electrons from Pb-208. APV 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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