Observation of cold, long-lived antiprotonic helium ions

Cold, two-body antiprotonic helium ions p 4He2+ and p 3He2+ with 100-ns-scale lifetimes, occupying circular states with the quantum numbers ni=28-32 and li=ni-1 have been observed. They were produced by cooling three-body antiprotonic helium atoms in an ultra-low-density helium target at temperature...

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Bibliographic Details
Published in:Physical review letters 2005-02, Vol.94 (6), p.063401.1-063401.4, Article 063401
Main Authors: HORI, M, EADES, J, YAMAZAKI, T, HAYANO, R. S, PIRKL, W, WIDMANN, E, YAMAGUCHI, H, TORII, H. A, JUHASZ, B, HORVATH, D, SUZUKI, K
Format: Article
Language:English
Subjects:
Antiproton-induced reactions
Atomic and molecular physics
Exact sciences and technology
Exotic atoms and molecules (containing mesons, muons, and other unusual particles)
Nuclear physics
Nuclear reactions: specific reactions
Physics
Studies of special atoms, molecules and their ions
clusters
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Summary:Cold, two-body antiprotonic helium ions p 4He2+ and p 3He2+ with 100-ns-scale lifetimes, occupying circular states with the quantum numbers ni=28-32 and li=ni-1 have been observed. They were produced by cooling three-body antiprotonic helium atoms in an ultra-low-density helium target at temperature T approximately 10 K by atomic collisions, and then removing their electrons by inducing a laser transition to an autoionizing state. The lifetimes of p 3He2+ against annihilation induced by collisions were shorter than those of p 4He2+, and decreased for larger-ni states.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.063401