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- W2040476676 abstract "Positronium formation and target excitation in positron-helium scattering have been investigated using the close-coupling approximation with realistic wave functions for the positronium and helium atoms. The following eight states have been used in the close-coupling scheme: $mathrm{He}(1s1s),$ $mathrm{He}{(1s2}^{1}s),$ $mathrm{He}{(1s2}^{1}p),$ $mathrm{He}{(1s3}^{1}s),$ $mathrm{He}{(1s3}^{1}p),$ $mathrm{Ps}(1s),$ $mathrm{Ps}(2s),$ and $mathrm{Ps}(2p),$ where Ps stands for the positronium atom. Calculations are reported of differential cross sections for elastic scatering, inelastic target excitation to $mathrm{He}{(1s2}^{1}s)$ and $mathrm{He}{(1s2}^{1}p)$ states, and rearrangement transition to $mathrm{Ps}(1s),$ $mathrm{Ps}(2s),$ and $mathrm{Ps}(2p)$ states for incident positron energies between 40 and 200 eV. The coincidence parameters for the transition to the $mathrm{He}{(1s2}^{1}p)$ state of helium are also reported and briefly discussed." @default.
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- W2040476676 title "Differential cross sections for target excitation and positronium formation in positron-helium scattering" @default.
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- W2040476676 doi "https://doi.org/10.1103/physreva.57.984" @default.
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