Observation of Cold, Long-Lived Antiprotonic Helium Ions | Zendy

M. Hori | Zendy; J. Eades | Zendy; R. Hayano | Zendy; W. Pirkl | Zendy; E. Widmann | Zendy; H. Yamaguchi | Zendy; H. Torii | Zendy; B. Juhász | Zendy; D. Horváth | Zendy; K. Suzuki | Zendy; Y. Yamazaki | Zendy

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Observation of Cold, Long-Lived Antiprotonic Helium Ions

Author(s) -

M. Hori,

J. Eades,

R. Hayano,

W. Pirkl,

E. Widmann,

H. Yamaguchi,

H. Torii,

B. Juhász,

D. Horváth,

K. Suzuki,

Y. Yamazaki

Publication year - 2005

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.94.063401

Subject(s) - atomic physics , helium , ion , physics , annihilation , electron , antiproton , materials science , nuclear physics , quantum mechanics , proton

Cold, two-body antiprotonic helium ions p /sup 4/He/sup 2+/ and p /sup 3/He/sup 2+/ with 100-ns-scale lifetimes, occupying circular states with the quantum numbers n/sub i/=28-32 and l/sub i/=n/sub i /-1 have been observed. They were produced by cooling three-body antiprotonic helium atoms in an ultra-low-density helium target at temperature T~10 K by atomic collisions, and then removing their electrons by inducing a laser transition to an autoionizing state. The lifetimes of p /sup 3/He/sup 2+/ against annihilation induced by collisions were shorter than those of p /sup 4/He/sup 2+/, and decreased for larger-n/sub i/ states

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