On the first-order approximations for positronium formation in atomic hydrogen
- 14 May 1979
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 12 (9) , 1603-1611
- https://doi.org/10.1088/0022-3700/12/9/012
Abstract
A class of first-order approximations-the first Born approximation, the first-order exchange approximation and the modified Born approximation-are applied to study the rearrangement collision process: e++H(1s) to (e+e-)(1s)+H+. Numerical results for the differential and total cross sections are presented for the positron energy range 8.704-2000 eV. The differential cross section in the first Born approximation shows quite different features from that given by the other two cases. It is believed from a comparison of the results at 2000 eV that the high-energy dependence of the cross sections may not be determined by the first Born approximation.Keywords
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