Abstract
We have combined the $L=0 \mathrm{and} 1$ partial-wave amplitudes obtained by a two-state coupled static approximation with correlation with the $L\ensuremath{\ge}2$ Born amplitudes to obtain the differential cross section for positronium formation in positron-atomic-hydrogen collisions. For positron energies of 0.64 and 0.75 Ry, minima at the scattering angles of 57\ifmmode^\circ\else\textdegree\fi{} and 51\ifmmode^\circ\else\textdegree\fi{} are found. Total cross sections for positronium formation for low and intermediate impact energies are given. Measurement of the differential cross section for the process ${e}^{+}+\mathrm{He}\ensuremath{\rightarrow}\mathrm{Ps}+{\mathrm{He}}^{+}$ for the detection of possible minima is suggested.
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