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- W2068148595 abstract "Proton and antiproton collisions with atomic hydrogen are investigated using the atomic-orbital close-coupling method. After a suitable transformation, the method leads to coupled three-dimensional momentum-space integral equations for the half-off-shell scattering amplitudes. These equations are further reduced to two-dimensional ones using the symmetry properties of the transition amplitudes. The resulting equations are solved directly without partial-wave expansion. The total and differential cross sections for electron transfer in proton collisions with the ground state of atomic hydrogen are calculated. The contribution of off-shell effects is fully taken into account and shown to be significant. We find that the off-shell effects can both increase or decrease the cross sections substantially depending on energy. At high energies as much as a half of the total electron transfer cross section comes from the off-shell effects. This contradicts classical and iterative estimates which predict the off-shell effects to be small. The significance of the off-shell effects in elastic scattering of protons falls with increasing energy to the estimated levels. The calculated cross section results agree well with experiment over a wide energy range. The total and differential cross sections for elastic scattering of antiprotons are also calculated and compared with the corresponding results for protons. Above 200 keV there is practically no difference between the cross sections for scattering of protons or antiprotons. The off-shell effects for elastic scattering of antiprotons are generally smaller than those for scattering of protons." @default.
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- W2068148595 date "2009-08-13" @default.
- W2068148595 modified "2023-09-23" @default.
- W2068148595 title "Three-dimensional integral-equation approach to proton- and antiproton-hydrogen collisions" @default.
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- W2068148595 doi "https://doi.org/10.1103/physreva.80.022704" @default.
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