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New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei

Abrahamyan, S.
; 
Shahinyan, A.
; 
Arrington, J.
; 
Armstrong, D. S.
; 
Averett, Todd
; 
Bailey, S. L.
; 
Deconinck, W.
; 
Finn, J. M.
; 
Fuchs, S. A.
; 
Glesener, L. E.
... show 6 more
Abstract
We have measured the beam-normal single-spin asymmetry An in the elastic scattering of 1-3 GeV transversely polarized electrons from H-1 and for the first time from He-4, C-12, and Pb-208. For H-1, He-4, and C-12, 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 Pb-208 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.
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2012-01-01
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Physics
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https://doi.org/10.1103/PhysRevLett.109.192501
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https://scholarworks.wm.edu/handle/internal/660
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