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    Low-energy l-mixing collisions of excited positronium with protons and antiprotons

    Access Status
    Fulltext not available
    Authors
    Fabrikant, I.
    Kadyrov, Alisher
    Bray, Igor
    Charlton, M.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Fabrikant, I. and Kadyrov, A. and Bray, I. and Charlton, M. 2017. Low-energy l-mixing collisions of excited positronium with protons and antiprotons. Journal of Physics B: Atomic, Molecular and Optical Physics. 50 (13): Article ID 134001.
    Source Title
    Journal of Physics B: Atomic, Molecular and Optical Physics
    DOI
    10.1088/1361-6455/aa743c
    ISSN
    0953-4075
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/54848
    Collection
    • Curtin Research Publications
    Abstract

    We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compare quantum cross sections with results of semiclassical and classical theories. In the semiclassical theory, the Ps atom is treated quantum-mechanically, whereas the relative Ps-p motion is described classically. For l-mixing processes there is a good agreement between quantum and semiclassical results, whereas classical theory strongly underestimates the l-mixing cross sections. The conclusions are important for the interpretation of Classical Trajectory Monte Carlo simulations and the use of their data in the design of experiments.

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