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

Reference:

Coleman, P. G., Cheesman, N. and Lowry, E. R., 2009. Coupling between positron-atom scattering channels above the first inelastic threshold. Physical Review Letters, 102 (17), 173201.

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Official URL:

http://dx.doi.org/10.1103/PhysRevLett.102.173201

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.

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