Ionization in positron-atom collisions
- 1 January 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 33 (1) , 756-758
- https://doi.org/10.1103/physreva.33.756
Abstract
Depending on the distribution of energy between the scattered positron and the ejected electron in the final channel, two competing processes are involved in positron-impact ionization of atoms, namely (a) direct head-on ionization of an electron and (b) positronium formation to the continuum. Using Faddeev’s three-body scattering formalism for positron–hydrogen-atom collisions, we get an amplitude which takes account of both these processes. The doubly differential cross section thus obtained for the forward scattering angle shows a cusp when plotted against the emission energy. The cusp is due to the effect of positronium formation to the continuum and heretofore has not been predicted.Keywords
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