| Autor: |
K.-H. Steffens, J. D. Kellie, S.J. Hall, L.D. Schearer, S. Plützer, E. Reichert, Werner Heil, J. Blume-Werry, Th. Dombo, H. G. Andresen, Ernst W. Otten, P. Grabmayr, Ch. Nachtigall, Daniela Rohe, R.O. Owens, H. Schmieden, T. Hehl, M. Schäfer, P. Hartmann, J. Hoffmann, Michèle Leduc, F. Klein, A. Frey, H. Fischer, Reinhard Surkau, M. Ostrick, J. Becker, D. Eyl, M. Meyerhoff, K. Aulenbacher, Th. Walcher, J. E. Ducret, P. Drescher, H. Möller, Jrm Annand |
| Rok vydání: |
1995 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| DOI: |
10.1063/1.48494 |
| Popis: |
A first measurement of the asymmetry in quasielastic scattering of longitudinally polarized electrons from a polarized 3 He gas target in coincidence with the knocked out neutron is reported. This measurement was made feasible by the cw beam of the 855 MeV Mainz Microtron MAMI. It allows a determination of the electric formfactor of the neutron G E n independent of binding effects to first order. At Q 2 =0.31 ( GeV /c) 2 two asymmetries A ∥ ( S He ∥ q ) and A ⊥ ( S He ⊥ q ) have been measured giving A ∥ =(−7.40±0.73)% and A ⊥ =(0.89±0.30)% . The ratio A ⊥ / A ∥ is independent of the absolute value of the electron and target polarization and yields G E n =0.035±0.012±0.005. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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