Positronium atom scattering by H_2 in a coupled-channel framework

Abstract

The scattering of ortho positronium (Ps) by H${}_2$ has been investigated using a three-Ps-state [Ps(1s,2s,2p)H${}_2($X ${}^1{\Sigma }_g^{+}$)] coupled-channel model and using Born approximation for higher excitations and ionization of Ps and B ${}^1{\Sigma }_u^{+}$ and b ${}^3{\Sigma }_u^{+}$ excitations of H${}_2$. We employ a recently proposed time-reversal-symmetric nonlocal electron-exchange model potential. We present a calculational scheme for solving the body-frame fixed-nuclei coupled-channel scattering equations for Ps-H${}_2$, which simplifies the numerical solution technique considerably. Ps ionization is found to have the leading contribution to target-elastic and all target-inelastic processes. The total cross sections at low and medium energies are in good agreement with experiment.

10 pages, 4 ps figures

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