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A surprising method for polarising antiprotons

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An Erratum to this article was published on 05 January 2009

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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Authors and Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany

    Th. Walcher, H. Arenhövel, K. Aulenbacher, R. Barday & A. Jankowiak

  2. Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, I-00044, Frascati (Rome), Italy

    Th. Walcher

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  1. Th. Walcher
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  2. H. Arenhövel
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  3. K. Aulenbacher
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  4. R. Barday
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  5. A. Jankowiak
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E. De Sanctis

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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