Electron Polarization Transfer Measured in a Heavy Nucleus at Jefferson Lab
The first phase of Jefferson Lab Experiment 89-033, "Measurement of Recoil Polarization in the 16O(e->,e' p->) Reaction with 2.4 GeV Electrons," has been completed in Hall A. This was the first measurement of polarization transfer in electron scattering from a heavy nucleus.
Over 30 coulombs of polarized beam were delivered to Halls A and C at total currents of up to 100 microamperes (for a few hours, with about 70 microamperes sustained). The beam polarization was monitored using the 5 MeV Mott polarimeter in the injector and Møller polarimeters in both halls. This was the first experiment using the polarized electron source at Jefferson Lab, and the experience provided valuable information on long-term operational issues associated with its use.
Parallel polarized-beam tests in both halls indicated that most helicity-correlated beam effects are already small enough to permit high-precision parity-violation experiments to be carried out at Jefferson Lab.
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