EXA 2011 pp 9-14 | Cite as

20 years of antiprotonic helium

Overview and history
  • Ryugo S. HayanoEmail author
Conference paper


Twenty years ago, we published a paper entitled “Discovery of antiproton trapping by long-lived metastable states in liquid helium”. In retrospect, this was the discovery of antiprotonic helium atoms, the study of which is actively being done at CERN’s antiproton decelerator. A brief overview of this interesting exotic atom is given, together with some historical background.


Antiprotonic helium atoms Fundamental constants Antiproton decelerator 


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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Department of PhysicsThe University of TokyoTokyoJapan

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