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• W1995433208 abstract "The scattering of orthopositronium (Ps) by hydrogen atoms has been investigated in a five-state coupled-channel model allowing for $mathrm{Ps}(1s)mathrm{H}(2s,2p)$ and $mathrm{Ps}(2s,2p)mathrm{H}(1s)$ excitations using a recently proposed electron-exchange model potential. The higher $(n>~3)$ excitations and ionization of the Ps atom are calculated using the first Born approximation. Calculations are reported of scattering lengths, phase shifts, elastic, Ps and H excitation, and total cross sections. Remarkable correlations are observed between the S-wave Ps-H binding energy and the singlet scattering length, effective range, and resonance energy obtained in various model calculations. These correlations suggest that if a Ps-H dynamical model yields the correct result for one of these four observables, it is expected to lead to the correct result for the other three. The present model, which is constructed so as to reproduce the Ps-H resonance at 4.01 eV, automatically yields a Ps-H bound state at $ensuremath{-}1.05$ eV that compares well with the accurate value of $ensuremath{-}1.067$ eV. The model leads to a singlet scattering length of ${3.72a}_{0}$ and effective range of ${1.67a}_{0},$ whereas the correlations suggest the precise values of ${3.50a}_{0}$ and ${1.65a}_{0}$ for these observables, respectively." @default.
• W1995433208 created "2016-06-24" @default.
• W1995433208 creator A5036005700 @default.
• W1995433208 creator A5071615077 @default.
• W1995433208 date "1999-03-01" @default.
• W1995433208 modified "2023-10-03" @default.
• W1995433208 title "Positronium–hydrogen-atom scattering in a five-state model" @default.
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• W1995433208 doi "https://doi.org/10.1103/physreva.59.2058" @default.
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