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    Positron scattering from argon: total cross sections and the scattering length

    Access Status
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    Authors
    Zecca, A
    Chiari, L
    Trainotti, E
    Fursa, Dmitry
    Bray, Igor
    Sakar, A
    Chattopadhyay, S
    Ratnavelu, K
    Brunger, M
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Zecca, A and Chiari, L and Trainotti, E and Fursa, D and Bray, I and Sakar, A and Chattopadhyay, S and Ratnavelu, K and Brunger, M. 2012. Positron scattering from argon: total cross sections and the scattering length. Journal of Physics B 45: 015203, pp. 1-6.
    Source Title
    Journal of Physics B
    DOI
    10.1088/0953-4075/45/1/015203
    ISSN
    0953-4075
    URI
    http://hdl.handle.net/20.500.11937/12022
    Collection
    • Curtin Research Publications
    Abstract

    We report results from new positron–argon total cross-section (TCS) measurements. Agreement with the corresponding recent data of Jones et al (2011 Phys. Rev. A 83 032701) is found to be very good, except at the lowest energies of common measurement. Excellent qualitative agreement is also found between our measurements and an improved convergent close-coupling (CCC) calculation which was undertaken as a part of this study. This level of accord between our experimental and theoretical TCSs has enabled us to determine an experimental scattering length (a) of a = -4.9 ± 0.7 au for the positron–argon system. That value is in excellent agreement with the relativistic polarized orbital optical potential approach result of Jones et al (a = -4.7 au) and our CCC result of a = -4.3 au.

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