Ionization of Helium and Argon by Very Slow Antiproton Impact

H. Knudsen, H.-P. E. Kristiansen, H. D. Thomsen, U. I. Uggerhøj, T. Ichioka, S. P. Møller, C. A. Hunniford, R. W. McCullough, M. Charlton, N. Kuroda, Y. Nagata, H. A. Torii, Y. Yamazaki, H. Imao, H. H. Andersen, and K. Tökesi
Phys. Rev. Lett. 101, 043201 – Published 25 July 2008

Abstract

The total cross sections for single ionization of helium and single and double ionization of argon by antiproton impact have been measured in the kinetic energy range from 3 to 25 keV using a new technique for the creation of intense slow antiproton beams. The new data provide benchmark results for the development of advanced descriptions of atomic collisions and we show that they can be used to judge, for the first time, the validity of the many recent theories.

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  • Received 17 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.043201

©2008 American Physical Society

Authors & Affiliations

H. Knudsen1, H.-P. E. Kristiansen1, H. D. Thomsen1, U. I. Uggerhøj1, T. Ichioka1,*, S. P. Møller2, C. A. Hunniford3, R. W. McCullough3, M. Charlton4, N. Kuroda5, Y. Nagata5, H. A. Torii5, Y. Yamazaki5,6, H. Imao6, H. H. Andersen7, and K. Tökesi8

  • 1Department of Physics and Astronomy, University of Aarhus, Denmark
  • 2Institute for Storage Ring Facilities, University of Aarhus, Denmark
  • 3Department of Physics, Queens University Belfast, United Kingdom
  • 4Department of Physics, University of Swansea, United Kingdom
  • 5Institute of Physics, Komaba, University of Tokyo, Japan
  • 6Atomic Physics Laboratory, RIKEN, (Saitama) Japan
  • 7Niels Bohr Institute, University of Copenhagen, Denmark
  • 8ATOMKI, Debrecen, Hungary

  • *Permanent address: Department of Information and Communication Technologies, Universitat Pompeu Fabra, Spain.

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Vol. 101, Iss. 4 — 25 July 2008

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