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Differential cross sections in antiproton- and proton-helium collisions

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Published under licence by IOP Publishing Ltd
, , Citation Kh Khayyat et al 1999 J. Phys. B: At. Mol. Opt. Phys. 32 L73 DOI 10.1088/0953-4075/32/4/002

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Author affiliations

1 Institut für Kernphysik, August-Euler-Straße 6, D60486 Frankfurt am Main, Germany

2 Gesellschaft für Schwerionenforschung, D64291 Darmstadt, Germany

3 Universität Freiburg, Fakultät für Physik, Hermann-Herderstraße 3, D79104 Freiburg, Germany

4 Institute of Physics and Astronomy, University of Aarhus, DK8000 Aarhus C, Denmark

5 Institute of Storage Ring Facilities, University of Aarhus, DK8000 Aarhus C, Denmark

6 Universidad de Buenos Aires, Departamento de Física, 1428 Buenos Aires, Argentina

7 The Queen's University of Belfast, School of Mathematics and Physics, Belfast BT7 1NN, UK

8 University of Missouri, Rolla, MO 65401, USA

9 Centro Atómico Bariloche, 8400 S C de Bariloche, Argentina

10 Tulane University, New Orleans, LA 70118, USA

Dates

  1. Received 24 November 1998

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0953-4075/32/4/L73

Abstract

Cross sections are presented for the first time for antiproton-helium collisions at an energy of 945 keV differential in longitudinal electron and recoil-ion momenta. The longitudinal momentum distributions for antiproton impact are compared with 1 MeV proton-helium collision. The electron and the recoil-ion momentum distributions for antiprotons agree with those for protons to within 10%. We did not observe a difference between antiproton impact and proton impact. A comparison with CDW and CTMC theories is presented.

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10.1088/0953-4075/32/4/002