Ay Measurement from ^3He^(e,e'n) Scattering at Jefferson Lab

Details Ay Measurement from ^3He^(e,e'n) Scattering at Jefferson Lab Ay Measurement from ^3He^(e,e'n) Scattering at Jefferson Lab

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprh10005l&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #H10.005

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Recently Ay asymmetry measurements have been conducted in Jefferson Lab's Hall A through electron scattering from a vertically polarized ^3He target. Experiment E08-005 measured the target single-spin asymmetry Ay in the quasi-elastic ^3He^(e,e'n) reaction. Plane wave impulse approximation (PWIA) predicts that Ay should be exactly zero. A previous experiment at Q^2 of 0.2 (GeV/c)^2, where full calculations of Laget and Nagorny indicated Ay to be small, showed a large asymmetry as calculated by the Bochum group using Faddeev calculations to solve the three-body problem exactly. The recent experiment measured this asymmetry at Q^2 of 0.1 (GeV/c)^2, 0.5 (GeV/c)^2 and 1.0 (GeV/c)^2. This is the first measurement of Ay at large Q^2, which is another region where Ay is expected to be small. Any non-zero result is an indication of effects beyond simple impulse approximation. This measurement will test the models used to extract neutron form factors from polarized ^3He. Details of the measurement will be presented.

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