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    Adiabatic-nuclei calculations of positron scattering from molecular hydrogen

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    Authors
    Zammit, M.
    Fursa, Dmitry
    Savage, J.
    Bray, Igor
    Chiari, L.
    Zecca, A.
    Brunger, M.
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Zammit, M. and Fursa, D. and Savage, J. and Bray, I. and Chiari, L. and Zecca, A. and Brunger, M. 2017. Adiabatic-nuclei calculations of positron scattering from molecular hydrogen. Physical Review A. 95 (2): pp. 022707-1-15.
    Source Title
    Physical Review A
    DOI
    10.1103/PhysRevA.95.022707
    ISSN
    1050-2947
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/50221
    Collection
    • Curtin Research Publications
    Abstract

    The single-center adiabatic-nuclei convergent close-coupling method is used to investigate positron collisions with molecular hydrogen (H2) in the ground and first vibrationally excited states. Cross sections are presented over the energy range from 1 to 1000 eV for elastic scattering, vibrational excitation, total ionization, and the grand total cross section. The present adiabatic-nuclei positron-H2 scattering length is calculated as A=−2.70a0 for the ground state and A=−3.16a0 for the first vibrationally excited state. The present elastic differential cross sections are also used to “correct” the low-energy grand total cross-section measurements of the Trento group [A. Zecca et al., Phys. Rev. A 80, 032702 (2009)] for the forward-angle-scattering effect. In general, the comparison with experiment is good. By performing convergence studies, we estimate that our Rm=1.448a0 fixed-nuclei results are converged to within ±5% for the major scattering integrated cross sections.

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