Ionization of helium by antiprotons: Fully correlated, four-dimensional lattice approach

Journal Article · Sat Feb 01 04:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.67.022712· OSTI ID:20633724

Schultz, D R; Krstic, P S ^[1]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372 (United States)

The single ionization of helium by antiproton impact has been studied utilizing a fully correlated, planar model in which the time-dependent Schroedinger equation was solved on a four-dimensional (4D) Cartesian lattice. The choice of a 'softcore' Coulomb potential was shown to enable approximate reproduction of the full six-dimensional p-barHe adiabatic electronic eigenenergy curves in the dynamically important region of the 4D space, thus providing a reasonable model to treat p-bar+He collisions. In addition, the applicability of this approach was demonstrated by favorable comparison of analogous two-dimensional lattice solutions for ionization of atomic hydrogen by antiprotons with previously computed three-dimensional lattice results. The present work aids in the interpretation of existing theoretical and experimental studies considering the low-energy behavior of the single-ionization cross section for antiproton impact of few-electron targets and explores the applicability of the planar model in describing correlated two-electron systems.

• OSTI ID: 20633724
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANTIPROTONS
ATOMS
COMPARATIVE EVALUATIONS
COULOMB FIELD
CROSS SECTIONS
EIGENFUNCTIONS
EIGENVALUES
ELECTRONS
HELIUM
HYDROGEN
ION-ATOM COLLISIONS
IONIZATION
MATHEMATICAL SOLUTIONS
SCHROEDINGER EQUATION
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS