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 HAL : in2p3-00745218, version 1
 arXiv : 1208.6164
 Physical Review Letters 109 (2012) 192501
 New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei
 HAPPEX Collaboration(s)
 (2012)
 We have measured the beam-normal single-spin asymmetry $A_n$ in the elastic scattering of 1-3 GeV transversely polarized electrons from $^1$H and for the first time from $^4$He, $^{12}$C, and $^{208}$Pb. For $^1$H, $^4$He and $^{12}$C, the measurements are in agreement with calculations that relate $A_n$ to the imaginary part of the two-photon exchange amplitude including inelastic intermediate states. Surprisingly, the $^{208}$Pb result is significantly smaller than the corresponding prediction using the same formalism. These results suggest that a systematic set of new $A_n$ measurements might emerge as a new and sensitive probe of the structure of heavy nuclei.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1208.6164
 in2p3-00745218, version 1 http://hal.in2p3.fr/in2p3-00745218 oai:hal.in2p3.fr:in2p3-00745218 Contributeur : Emmanuelle Vernay <> Soumis le : Jeudi 25 Octobre 2012, 08:50:30 Dernière modification le : Mardi 6 Novembre 2012, 08:43:50