Science 5 November 2010:
Vol. 330. no. 6005, p. 789
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Electron-Like Scattering of Positronium
S. J. Brawley, S. Armitage,* J. Beale, D. E. Leslie, A. I. Williams, G. Laricchia
Positronium (Ps), a hydrogen-like atom composed of an electron and its antimatter partner, the positron, is formed in considerable quantities whenever positrons interact with matter. It has unexpectedly been found to scatter from a wide variety of atoms and molecules in a way very similar to that of a bare electron moving at the same velocity, despite Ps being neutral and twice the mass.
UCL Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
* Present address: Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
Present address: Atomic Weapons Establishment, Aldermaston, Reading RG 7 4PR, UK.
Present address: Brunel University, Uxbridge UB8 3PH, UK.
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