Abstract
s-wave scattering of positrons on atomic hydrogen is treated by solving the Faddeev equations. Elastic phase shifts below the Ps(n-1) excitation threshold and the K-matrix elements within the ore gap between the Ps(n=1) and H(n=2) thresholds are calculated as well as the zero-energy 2\ensuremath{\gamma} annihilation rate of the ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ pair.
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