Abstract
For making polarized antiproton beams the so called filter method is normally discussed. It is based on the depletion of one spin component due to the spin dependent interaction if a stored beam passes a polarized target. The method has been proven by the FILTEX collaboration and detailed studies are presently performed by the PAX collaboration. Another source for polarized antiprotons is the antilambda decay as it was used in the only experiment with polarized antiprotons so far at FERMILAB. Furthermore the antiproton production process itself if showing polarisation, would be by far the best way to get polarized [Formula: see text]. It can be assumed to result from a quasi-free proton-nucleon collison. Up to now it has never been investigated in detail. In such a hadronic interaction the antiprotons may have substantial polarisation which would simplify the preparation of a polarized antiproton beam drastically. It is proposed to measure the polarisation of antiprotons produced in a fixed target experiment.
Highlights
A dedicated facility for low energy antiproton research (LEAR) was built at CERN in the 1980s
Many proposals for experiments with antiprotons came up but not all suggestions could be realized at LEAR and some of these propositions were updated in view of the upcoming antiproton facility at FAIR including the preparation of polarized antiproton beams
The feasibilty of the method depends on the magnitude and the difference of the spin-spin singlet and triplet cross sections
Summary
A dedicated facility for low energy antiproton research (LEAR) was built at CERN in the 1980s. The spin filter method in a storage ring was first suggested in 1968 in order to polarize high energy protons in the CERN ISR [1]. For antiprotons the filter method with cooling should work if one can find any filter interaction with both large spin-spin dependence and cross section.
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