Single ionization of helium by 40–3000-keV antiprotons
- 1 June 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 41 (11), 6536-6539
- https://doi.org/10.1103/physreva.41.6536
Abstract
Measurements of single-ionization cross sections for antiproton impact on helium atoms are reported for impact energies ranging from 40 keV to 3 MeV. It is found that the measured cross sections are in good agreement with recent theoretical estimates based on the continuum-distorted-wave approximation. From a comparison with similar proton data, the ratio between antiproton and proton results is obtained. The energy dependence of this ratio is compared with various theoretical estimates and explained as a result of polarization and binding effects.Keywords
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