Abstract
The polarization buildup in a p p ¯ beam which is due to the interaction of stored antiprotons with polarized protons of a hydrogen target is considered. The corresponding cross section is calculated using the Paris nucleon–antinucleon optical potential in the energy interval 20 < T lab < 100 MeV. It follows from this estimate that, at realistic parameters of a storage ring and a target, the filtering mechanism can provide a noticeable polarization in a time comparable with the beam lifetime.
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