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    Near-threshold behavior of positronium-antiproton scattering

    Access Status
    Fulltext not available
    Authors
    Fabrikant, I.
    Bray, A.
    Kadyrov, Alisher
    Bray, I.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Fabrikant, I. and Bray, A. and Kadyrov, A. and Bray, I. 2016. Near-threshold behavior of positronium-antiproton scattering. Physical Review A. 94 (1): pp. 012701-012706.
    Source Title
    Physical Review A
    DOI
    10.1103/PhysRevA.94.012701
    ISSN
    2469-9926
    School
    Department of Physics and Astronomy
    Remarks

    Copyright © 2016 by the American Physical Society

    URI
    http://hdl.handle.net/20.500.11937/32693
    Collection
    • Curtin Research Publications
    Abstract

    Using the convergent close-coupling theory we study the threshold behavior of cross sections for positronium (Ps) of energy E scattering on antiprotons. In the case of Ps(1s) elastic scattering, simple power laws are observed for all partial waves studied. The partial-wave summed cross section is nearly constant, and dominates the antihydrogen formation cross section at all considered energies, even though the latter is exothermic and behaves as 1/E1/2. For Ps(2s), oscillations spanning orders of magnitude on top of the 1/E behavior are found in the elastic and quasielastic cross sections. The antihydrogen formation is influenced by dipole-supported resonances below the threshold of inelastic processes. Resonance energies form a geometric progression relative to the threshold. The exothermic antihydrogen formation cross sections behave as 1/E at low energies, but are oscillation free. We demonstrate that all these rich features are reproduced by the threshold theory developed by Gailitis.

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