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

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

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 o...

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Veröffentlicht in:Physical review letters 2012-03, Vol.108 (11), p.112502-112502
Hauptverfasser: 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, Kliakhandler, K, King, P M, Kowalski, S, Kumar, K S, Leacock, J, Leckey, 4th, J, Lee, J H, LeRose, J J, Lindgren, R, Liyanage, N, Lubinsky, N, Mammei, J, Mammoliti, F, Margaziotis, D J, Markowitz, P, McCreary, A, McNulty, D, Mercado, L, Meziani, Z-E, Michaels, R W, Mihovilovic, M, Muangma, N, Muñoz-Camacho, C, Nanda, S, Nelyubin, V, Nuruzzaman, N, Oh, Y, Palmer, A, Parno, D, Paschke, K D, Phillips, S K, Poelker, B, Pomatsalyuk, R, Posik, M, Puckett, A J R, Quinn, B, Rakhman, A, Reimer, P E, Riordan, S, Rogan, P
Format: Artikel
Sprache:eng
Schlagworte:
ASYMMETRY
DISTRIBUTION
ELASTIC SCATTERING
ELECTRONS
NEUTRONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTONS
SCATTERING
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114