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Coupling between positronium formation and elastic positron-scattering channels in the rare gases


Reference:

Jay, P. M. and Coleman, P. G., 2010. Coupling between positronium formation and elastic positron-scattering channels in the rare gases. Physical Review A - Atomic, Molecular, and Optical Physics, 82 (1), 012701.

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    Official URL:

    http://dx.doi.org/10.1103/PhysRevA.82.012701

    Abstract

    Measurements of elastic-scattering cross sections are presented for positron collisions with helium, neon, argon, krypton, and xenon around the threshold energy for positronium (Ps) formation. The elastic cross section falls slowly with increasing energy above the Ps formation threshold in helium and neon, whereas in argon, krypton, and xenon it exhibits an increase, which appears both more prominent and more sustained as the atomic number of the gas increases. It is proposed that this coupling is a result of an intermediate virtual Ps state that enhances branching into the (atom plus positron) final state.

    Details

    Item Type Articles
    CreatorsJay, P. M.and Coleman, P. G.
    DOI10.1103/PhysRevA.82.012701
    DepartmentsFaculty of Science > Physics
    Publisher StatementJay_Coleman_PRA_July_2010.pdf: The definitive version is available from http://dx.doi.org/10.1103/PhysRevA.82.012701; Jay_Coleman_PRA_July_2010.doc: The definitive version is available from http://dx.doi.org/10.1103/PhysRevA.82.012701
    RefereedYes
    StatusPublished
    ID Code20149

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