Observation of cold, long-lived antiprotonic helium ions

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

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Cold, two-body antiprotonic helium ions p̄4He2+ and p̄3He2+ with 100-ns-scale lifetimes, occupying circular states with the quantum numbers n; = 28-32 and li = n 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 p̄3He2+ against annihilation induced by collisions were shorter than those of p̄4He2+, and decreased for larger-ni states.

Original languageEnglish
Article number063401
JournalPhysical Review Letters
Volume94
Issue number6
DOIs
Publication statusPublished - Feb 18 2005

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helium ions
life (durability)
atomic collisions
helium atoms
quantum numbers
helium
cooling
collisions
lasers
electrons
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Hori, M., Eades, J., Hayano, R. S., Pirkl, W., Widmann, E., Yamaguchi, H., ... Yamazaki, T. (2005). Observation of cold, long-lived antiprotonic helium ions. Physical Review Letters, 94(6), [063401]. https://doi.org/10.1103/PhysRevLett.94.063401

Observation of cold, long-lived antiprotonic helium ions. / Hori, M.; Eades, J.; Hayano, R. S.; Pirkl, W.; Widmann, E.; Yamaguchi, H.; Torii, H. A.; Juhász, B.; Horváth, D.; Suzuki, K.; Yamazaki, T.

In: Physical Review Letters, Vol. 94, No. 6, 063401, 18.02.2005.

Research output: Contribution to journalArticle

Hori, M, Eades, J, Hayano, RS, Pirkl, W, Widmann, E, Yamaguchi, H, Torii, HA, Juhász, B, Horváth, D, Suzuki, K & Yamazaki, T 2005, 'Observation of cold, long-lived antiprotonic helium ions', Physical Review Letters, vol. 94, no. 6, 063401. https://doi.org/10.1103/PhysRevLett.94.063401
Hori M, Eades J, Hayano RS, Pirkl W, Widmann E, Yamaguchi H et al. Observation of cold, long-lived antiprotonic helium ions. Physical Review Letters. 2005 Feb 18;94(6). 063401. https://doi.org/10.1103/PhysRevLett.94.063401
Hori, M. ; Eades, J. ; Hayano, R. S. ; Pirkl, W. ; Widmann, E. ; Yamaguchi, H. ; Torii, H. A. ; Juhász, B. ; Horváth, D. ; Suzuki, K. ; Yamazaki, T. / Observation of cold, long-lived antiprotonic helium ions. In: Physical Review Letters. 2005 ; Vol. 94, No. 6.
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AU - Torii, H. A.

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