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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
