Abstract
The polarization of an 8-12-MeV proton beam produced by a Lamb-shift ion source has been determined with 0.4% absolute accuracy by an atomic-beam technique. The procedure, which involves selection of a single hyperfine state of fast $\mathrm{H}(2s)$ atoms, is ideally suited to routine monitoring of beam polarization. Absolute $p\ensuremath{-}^{4}\mathrm{He}$ elastic-scattering analyzing powers measured with the calibrated beam are reported, and existing double-scattering data are compared with these results.
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