Electron-like scattering of positronium.
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.
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