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Phys. Rev. Lett. 101, 043201 (2008) [4 pages]

Ionization of Helium and Argon by Very Slow Antiproton Impact

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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

Received 17 March 2008; published 25 July 2008

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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.043201
DOI:
10.1103/PhysRevLett.101.043201
PACS:
34.10.+x, 34.50.Fa

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

 
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