Coupling between positron-atom scattering channels above the first inelastic threshold

Paul G Coleman, N Cheesman, E R Lowry

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Experimentally determined cross sections for the elastic scattering of positrons by argon and xenon atoms have been found to exhibit a steplike increase at the first inelastic threshold energy-i.e., that for positronium formation. Rather than supporting the existence of a cusplike behavior predicted theoretically, this feature, which is more pronounced for xenon, suggests the existence of an intermediate virtual positronium state which enhances the elastic interaction probability.
Original languageEnglish
Article number173201
Number of pages3
JournalPhysical Review Letters
Volume102
Issue number17
Early online date30 Apr 2009
DOIs
Publication statusPublished - 1 May 2009

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