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Title: Evaluation of antiproton-impact ionization of He atoms below 40 keV

Abstract

We have performed extensive close-coupling calculations to obtain total impact ionization cross sections of He atoms by antiprotons at energies from 1 keV to 300 keV by expanding the time-dependent two-electron wave functions in terms of helium eigenstates. The stability of the calculated ionization probabilities and total ionization cross sections with respect to the choice of basis functions has been examined. Our total ionization cross sections are only slightly higher than the results from the forced-impulse approximation of Reading et al. [J. Phys. B 30, L189 (1997)] but they disagree with the existing experimental data below 40 keV [Hvelplund et al., J. Phys. B 27, 925 (1994)]. We conclude that new measurements for the ionization of He by antiprotons are needed in the low-energy region. (c) 2000 The American Physical Society.

Authors:
 [1];  [2];  [1]
  1. Department of Physics, Kansas State University, Manhattan, Kansas 66506-2601 (United States)
  2. Department of Physics, Chung Yuan Christian University, Chung Li, Taiwan 32023, Republic of China (China)
Publication Date:
OSTI Identifier:
20216554
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 61; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; IONIZATION; ANTIPROTONS; HELIUM 4; KEV RANGE 01-10; KEV RANGE 10-100; KEV RANGE 100-1000; CROSS SECTIONS; WAVE FUNCTIONS; EIGENSTATES; ATOM COLLISIONS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Lee, T. G., Tseng, H. C., and Lin, C. D. Evaluation of antiproton-impact ionization of He atoms below 40 keV. United States: N. p., 2000. Web. doi:10.1103/PhysRevA.61.062713.
Lee, T. G., Tseng, H. C., & Lin, C. D. Evaluation of antiproton-impact ionization of He atoms below 40 keV. United States. doi:10.1103/PhysRevA.61.062713.
Lee, T. G., Tseng, H. C., and Lin, C. D. Thu . "Evaluation of antiproton-impact ionization of He atoms below 40 keV". United States. doi:10.1103/PhysRevA.61.062713.
@article{osti_20216554,
title = {Evaluation of antiproton-impact ionization of He atoms below 40 keV},
author = {Lee, T. G. and Tseng, H. C. and Lin, C. D.},
abstractNote = {We have performed extensive close-coupling calculations to obtain total impact ionization cross sections of He atoms by antiprotons at energies from 1 keV to 300 keV by expanding the time-dependent two-electron wave functions in terms of helium eigenstates. The stability of the calculated ionization probabilities and total ionization cross sections with respect to the choice of basis functions has been examined. Our total ionization cross sections are only slightly higher than the results from the forced-impulse approximation of Reading et al. [J. Phys. B 30, L189 (1997)] but they disagree with the existing experimental data below 40 keV [Hvelplund et al., J. Phys. B 27, 925 (1994)]. We conclude that new measurements for the ionization of He by antiprotons are needed in the low-energy region. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevA.61.062713},
journal = {Physical Review. A},
issn = {1050-2947},
number = 6,
volume = 61,
place = {United States},
year = {2000},
month = {6}
}