Proton angular distributions and highly differential cross sections for ionization of helium by proton impact

H. Fukuda, I. Shimamura, L. Végh, and T. Watanabe
Phys. Rev. A 44, 1565 – Published 1 August 1991
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Abstract

The eikonal distorted-wave method is applied to single ionization in proton-helium collisions at laboratory energies of 300 keV, 500 keV, 1 MeV, and 3 MeV. The angular distributions of scattered protons agree well with recent experimental results, showing substantial improvement over the plane-wave Born approximation especially at large scattering angles Θ. The momentum distributions of the ejected electrons at fixed values of Θ are calculated. In particular, those of the electrons ejected mainly in binary proton-electron collisions are studied in detail. The momentum distributions of the recoil He+ ions at fixed values of Θ are also discussed by comparing with the results of recent coincidence measurements. At such small Θ at which the plane-wave Born and the eikonal distorted-wave approximations give nearly the same cross sections and are expected to be accurate, these approximations lead to average momenta of recoil ions significantly lower than the measured values.

  • Received 30 January 1991

DOI:https://doi.org/10.1103/PhysRevA.44.1565

©1991 American Physical Society

Authors & Affiliations

H. Fukuda, I. Shimamura, L. Végh, and T. Watanabe

  • RIKEN (Institute of Physical and Chemical Research), Wako, Saitama 351-01, Japan

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Issue

Vol. 44, Iss. 3 — August 1991

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