Effects of impurity molecules on the lifetime of antiprotonic helium atoms

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)...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2004, Vol.214, p.98-102
Main Authors: Juhász, B, Eades, J, Hayano, R.S, Hori, M, Horváth, D, Ishikawa, T, Torii, H.A, Widmann, E, Yamaguchi, H, Yamazaki, T
Format: Article
Language:English
Subjects:
Antiprotonic helium
Deuterium
Hydrogen
Quantum tunneling
Temperature dependence of quenching cross section
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Summary: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.
ISSN:0168-583X
1872-9584
DOI:10.1016/S0168-583X(03)01769-5