Abstract.
We propose a method for polarising antiprotons in a storage ring by means of a polarised positron beam moving parallel to the antiprotons. If the relative velocity is adjusted to v/c ≈ 0.002 the cross-section for spin-flip is as large as about 2 . 1013 barn as shown by new QED calculations of the triple spin cross-sections. Two possibilities for providing a positron source with sufficient flux density are presented. A polarised positron beam with a polarisation of 0.70 and a flux density of approximately 1.5 . 1010 /(mm2 s) appears to be feasible by means of a radioactive 11C dc-source. A more involved proposal is the production of polarised positrons by pair production with circularly polarised photons. It yields a polarisation of 0.76 and requires the injection into a small storage ring. Such polariser sources can be used at low (100MeV) as well as at high (1GeV) energy storage rings providing a time of about one hour for polarisation build-up of about 1010 antiprotons to a polarisation of about 0.18. A comparison with other proposals show a gain in the figure of merit by a factor of about ten.
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An erratum to this article can be found at http://dx.doi.org/10.1140/epja/i2008-10705-4.
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Walcher, T., Arenhövel, H., Aulenbacher, K. et al. A surprising method for polarising antiprotons. Eur. Phys. J. A 34, 447–461 (2007). https://doi.org/10.1140/epja/i2007-10462-x
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DOI: https://doi.org/10.1140/epja/i2007-10462-x