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

Antonio Zecca, Luca Chiari, E Trainotti, D Fursa, I Bray, Anindya Sarkar, S Chattopadhyay, K Ratnavelu, Michael Brunger

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    41 Citations (Scopus)

    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.

    Original languageEnglish
    Article number015203
    Pages (from-to)015203-1-015203-6
    Number of pages6
    JournalJournal of Physics B-Atomic Molecular and Optical Physics
    Volume45
    Issue number1
    DOIs
    Publication statusPublished - 14 Jan 2012

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