New PRL on positronium

Last updated May 29, 2017 by Andrew Brown

A striking similarity between positronium and electron scattering from atoms and molecules observed experimentally [S. J. Brawley et al., Science 330, 789 (2010)] has been explained. Positronium (Ps) is a hydrogen-like neutral “atom” consisting of an electron and positron. A paper by Ilya Fabrikant (University of Nebraska) and Gleb Gribakin (CTAMOP) [Phys. Rev. Lett 112, 243201 (2014)] shows that when Ps scatters from noble-gas atoms at intermediate velocities (v=0.5-2 atomic units), the electron within Ps gives a dominant contribution to the Ps-atom interaction. The main reason behind this phenomenon is the distinct exchange interaction which affects the electron-atom scattering but is absent in the positron-atom system. Calculations performed in the Impulse Approximation support this understanding and show good agreement with experiment.


About CTAMOP:

We are a Research Cluster of the School of Mathematics and Physics at Queen’s University Belfast in Northern Ireland. Our research interests are focused primarily on computational and theoretical physics.

Old Physics Building

The Old Physics Building,
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