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

Abstract

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
Volume214
Issue numberSUPPL.
DOIs
Publication statusPublished - Jan 1 2004
EventLow Energy Antiproton Physics (LEAP'03) - Jamashita-park, Japan
Duration: Mar 3 2003Mar 7 2003

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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