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Phys. Rev. Lett. 89, 213401 (2002) [4 pages]

Background-Free Observation of Cold Antihydrogen with Field-Ionization Analysis of Its States

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G. Gabrielse1,*, N. S. Bowden1, P. Oxley1, A. Speck1, C. H. Storry1, J. N. Tan1, M. Wessels1, D. Grzonka2, W. Oelert2, G. Schepers2, T. Sefzick2, J. Walz3, H. Pittner4, T. W. Hänsch4,5, and E. A. Hessels6 (ATRAP Collaboration)
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138
2IKP, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
3CERN, 1211 Geneva 23, Switzerland
4Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
5Ludwig-Maximilians-Universität München, Schellingstrasse 4/III, 80799 München, Germany
6York University, Department of Physics and Astronomy, Toronto, Ontario, Canada M3J 1P3

Received 11 October 2002; published 31 October 2002

A background-free observation of cold antihydrogen atoms is made using field ionization followed by antiproton storage, a detection method that provides the first experimental information about antihydrogen atomic states. More antihydrogen atoms can be field ionized in an hour than all the antimatter atoms that have been previously reported, and the production rate per incident high energy antiproton is higher than ever observed. The high rate and the high Rydberg states suggest that the antihydrogen is formed via three-body recombination.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.213401
DOI:
10.1103/PhysRevLett.89.213401
PACS:
36.10.–k

*ATRAP spokesperson.

Email address: gabrielse@physics.harvard.edu

See Also

Comment: C. F. Driscoll, Comment on “Driven Production of Cold Antihydrogen and the First Measured Distribution of Antihydrogen States”, Phys. Rev. Lett. 92, 149303 (2004).

Reply: G. Gabrielse, N. S. Bowden, P. Oxley, A. Speck, C. H. Storry, J. N. Tan, M. Wessels, D. Grzonka, W. Oelert, G. Schepers, T. Sefzick, J. Walz, H. Pittner, T. W. Hänsch, and E. A. Hessels ATRAP Collaboration, Gabrielse et al. Reply:, Phys. Rev. Lett. 92, 149304 (2004).

 
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