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. 2012 Mar 16;108(11):112502.
doi: 10.1103/PhysRevLett.108.112502. Epub 2012 Mar 15.

Measurement of the neutron radius of 208Pb through parity violation in electron scattering

S Abrahamyan  1 , Z Ahmed, H Albataineh, K Aniol, D S Armstrong, W Armstrong, T Averett, B Babineau, 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 4th, 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 Muñoz-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; PREX Collaboration
Affiliations

Measurement of the neutron radius of 208Pb through parity violation in electron scattering

S Abrahamyan et al. Phys Rev Lett. .

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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