Energy dependence of the positronium formation cross-section in argon


Thornton, M. J. and Coleman, P. G., 2011. Energy dependence of the positronium formation cross-section in argon. Journal of Physics B: Atomic Molecular and Optical Physics, 44 (14), 145201.

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    The positronium (Ps) formation cross-section, Q(Ps), for positron-argon interactions has been measured for incident positron energies from threshold to 60 eV, in an attempt to resolve the apparent discrepancy between earlier experimental results. Q(Ps) was found to vary smoothly with positron energy between 15 and 30 eV, in qualitative agreement with earlier results using methods involving the measurement of positron neutralization (as in the current experiment) and in disagreement with the double-peak energy dependence reported by Laricchia et al (2002 J. Phys. B: At. Mol. Opt. Phys. 35 2525-40), who used a positron-ion coincidence detection method. Possible reasons for this discrepancy, including Ps fragmentation and excited-state Ps formation, are discussed.


    Item Type Articles
    CreatorsThornton, M. J.and Coleman, P. G.
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    DepartmentsFaculty of Science > Physics
    Publisher StatementColeman_JoPB_2011_44_14_145201.pdf: © 2011 IOP Publishing Ltd;Coleman_JoPB_2011_44_14_145201.docx: © 2011 IOP Publishing Ltd
    ID Code25094


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