• Open Access

Trapped Antihydrogen in Its Ground State

G. Gabrielse, R. Kalra, W. S. Kolthammer, R. McConnell, P. Richerme, D. Grzonka, W. Oelert, T. Sefzick, M. Zielinski, D. W. Fitzakerley, M. C. George, E. A. Hessels, C. H. Storry, M. Weel, A. Müllers, and J. Walz (ATRAP Collaboration)
Phys. Rev. Lett. 108, 113002 – Published 16 March 2012


Antihydrogen atoms (H¯) are confined in an Ioffe trap for 15–1000 s—long enough to ensure that they reach their ground state. Though reproducibility challenges remain in making large numbers of cold antiprotons (p¯) and positrons (e+) interact, 5±1 simultaneously confined ground-state atoms are produced and observed on average, substantially more than previously reported. Increases in the number of simultaneously trapped H¯ are critical if laser cooling of trapped H¯ is to be demonstrated and spectroscopic studies at interesting levels of precision are to be carried out.

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  • Received 27 December 2011


This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

G. Gabrielse1,*, R. Kalra1, W. S. Kolthammer1, R. McConnell1, P. Richerme1, D. Grzonka2, W. Oelert2, T. Sefzick2, M. Zielinski2, D. W. Fitzakerley3, M. C. George3, E. A. Hessels3, C. H. Storry3, M. Weel3, A. Müllers4, and J. Walz4 (ATRAP Collaboration)

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2IKP, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • 3Department of Physics and Astronomy, York University, Toronto, Ontario M3J 1P3, Canada
  • 4Institut für Physik, Johannes Gutenberg Universität and Helmholtz Institut Mainz, D-55099 Mainz, Germany

  • *ATRAP Spokesperson. gabrielse@physics.harvard.edu

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Vol. 108, Iss. 11 — 16 March 2012

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