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Atoms 2016, 4(4), 27;

Positron-Hydrogen Scattering, Annihilation, and Positronium Formation

Heliophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
Academic Editor: Chi Yu Hu
Received: 14 September 2016 / Revised: 19 October 2016 / Accepted: 26 October 2016 / Published: 4 November 2016
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In previous papers (Bhatia A.K. 2007, 2012) a hybrid theory for the scattering of electrons from a hydrogenic system was developed and applied to calculate scattering phase shifts, Feshbach resonances, and photoabsorption processes. This approach is now being applied to the scattering of positrons from hydrogen atoms. Very accurate phase shifts, using the Feshbach projection operator formalism, were calculated previously (Bhatia A.K. et al. 1971 and Bhatia et al. 1974a). The present results, obtained using shorter expansions in the correlation function, along with long-range correlations in the Schrödinger equation, agree very well with the results obtained earlier. The scattering length is also calculated and the present results are compared with the previous results. Annihilation cross-sections, and positronium formation cross-sections, calculated in the distorted-wave approximation, are also presented. View Full-Text
Keywords: positron scattering; annihilation; positron formation positron scattering; annihilation; positron formation

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Bhatia, A.K. Positron-Hydrogen Scattering, Annihilation, and Positronium Formation. Atoms 2016, 4, 27.

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