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dc.contributor.authorFabrikant, I.
dc.contributor.authorKadyrov, Alisher
dc.contributor.authorBray, Igor
dc.contributor.authorCharlton, M.
dc.identifier.citationFabrikant, I. and Kadyrov, A. and Bray, I. and Charlton, M. 2017. Low-energy l-mixing collisions of excited positronium with protons and antiprotons. Journal of Physics B: Atomic, Molecular and Optical Physics. 50 (13): Article ID 134001.

We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compare quantum cross sections with results of semiclassical and classical theories. In the semiclassical theory, the Ps atom is treated quantum-mechanically, whereas the relative Ps-p motion is described classically. For l-mixing processes there is a good agreement between quantum and semiclassical results, whereas classical theory strongly underestimates the l-mixing cross sections. The conclusions are important for the interpretation of Classical Trajectory Monte Carlo simulations and the use of their data in the design of experiments.

dc.publisherInstitute of Physics Publishing Ltd.
dc.titleLow-energy l-mixing collisions of excited positronium with protons and antiprotons
dc.typeJournal Article
dcterms.source.titleJournal of Physics B: Atomic, Molecular and Optical Physics
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusFulltext not available

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