The PAX Collaboration engaged the challenge to investigate the spin-dependendent cross-sections in order to exploit them for the polarization of antiproton beams. The commissioning of the tranverse case has been fullfilled on the proton COSY ring at the ForschungsZentrum of Jülich, and the results are milestones for the understanding of spin-dependent cross-sections. The whole panorama of spin-dependent interactions of proton beam on polarized proton target will be completed with the longitudinal case under preparation. Meanwhile the possibility of exploring the spin-filtering process with a deuteron polarized target, involves the upgrading of the PAX target for its daily switch from H to D, and vice versa, for its use in same beam time period
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