Numerical solution of the time-dependent Schr{umlt o}dinger equation for intermediate-energy collisions of antiprotons with hydrogen
- Institute for Theoretical Atomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States)
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6373 (United States)
- Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
We study the behavior of ionization in intermediate-energy collisions of antiprotons with atomic hydrogen by direct solution of the time-dependent Schr{umlt o}dinger equation represented on a three-dimensional Cartesian lattice. Total cross sections for these processes are computed over the collision energy range of 0.2 to 500 keV from knowledge of the asymptotic state probabilities as a function of impact parameter. The computed ionization cross sections are in good agreement with results from recent experiments conducted at CERN [Phys. Rev. Lett. {bold 74}, 4627 (1995)]. In the energy range from 0.2 to 30 keV, for which measurements are not available, our calculations are in qualitative agreement with other results based on classical-trajectory and coupled-channel methods, confirming the predicted significant difference from the analog proton-impact ionization process. This contrast with proton-hydrogen collisions is also explored qualitatively by employing a model two-dimensional space in which lattice solutions are less computationally intensive. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Oak Ridge National Laboratory
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 285942
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 1 Vol. 54; ISSN PLRAAN; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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