Effects of impurity molecules on the lifetime of antiprotonic helium atoms

B. Juhász, J. Eades, R. S. Hayano, M. Hori, D. Horváth, T. Ishikawa, H. A. Torii, E. Widmann, H. Yamaguchi, T. Yamazaki

Research output: Contribution to journalConference article


Quenching of metastable antiprotonic helium atoms in collisions with hydrogen and deuterium molecules has been studied using laser spectroscopy at CERN's antiproton decelerator. The temperature dependence of the quenching cross sections of the antiprotonic states (n,l) = (37, 34), (38, 35) and (38, 37) has been investigated and a deviation from the Arrhenius law was found at low temperatures. In case of the state (38, 37) with deuterium, detailed measurements revealed that the quenching cross section levels off at low temperatures indicating a strong quantum tunneling effect.

Original languageEnglish
Pages (from-to)98-102
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue numberSUPPL.
Publication statusPublished - Jan 1 2004
EventLow Energy Antiproton Physics (LEAP'03) - Jamashita-park, Japan
Duration: Mar 3 2003Mar 7 2003


  • Antiprotonichelium
  • Deuterium
  • Hydrogen
  • Quantum tunneling
  • Temperature dependence of quenching cross section

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Fingerprint Dive into the research topics of 'Effects of impurity molecules on the lifetime of antiprotonic helium atoms'. Together they form a unique fingerprint.

  • Cite this