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Positronium collision physics

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La Rivista del Nuovo Cimento Aims and scope

Summary

This article presents a combined experimental and theoretical overview of positronium collisions with atoms and molecules. It starts with a description of the basic properties of positronium. This is followed by a survey of experimental methods. These include positron annihilation lifetime spectroscopy (PALS and SSPALS), angular correlation of annihilation radiation (ACAR), Doppler broadening (DB), positronium beam experiments, and many-positron techniques. Theoretical developments are next described, including the Born approximation, coupled-state methods, variational techniques, stabilization methods, model potentials, Monte Carlo methods, the impulse approximation, and resonances. There then follows a critical comparison between experiment and theory on low-energy momentum transfer cross-sections, total cross-sections, integral and differential ionization cross-sections, and positronium-positronium scattering. Comparison is also made with equivelocity free electron and positron scattering, highlighting the remarkable result that positronium scattering tends to follow that of a bare electron. The article concludes with a look towards future directions.

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Authors and Affiliations

  1. UGL Department of Physics and Astronomy, University College London, Gower Street, WG1E 6BT, London, UK

    G. Laricchia

  2. Centre for Theoretical Atomic, Molecular, and Optical Physics School of Mathematics and Physics, Queen’s University, BT7 INN, Belfast, UK

    H. R. J. Walters

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Laricchia, G., Walters, H.R.J. Positronium collision physics. Riv. Nuovo Cim. 35, 305–351 (2012). https://doi.org/10.1393/ncr/i2012-10077-6

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