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Phys. Rev. Lett. 89, 093401 (2002) [4 pages]

Primary Populations of Metastable Antiprotonic 4He and 3He Atoms

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M. Hori1, J. Eades1, R. S. Hayano2, T. Ishikawa2, J. Sakaguchi2, T. Tasaki2, E. Widmann2, H. Yamaguchi2, H. A. Torii3, B. Juhász4, D. Horváth5, and T. Yamazaki6
1CERN, CH-1211 Geneva 23, Switzerland
2Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
3Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan
4Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary
5KFKI Research Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary
6RI Beam Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

Received 8 December 2001; published 7 August 2002

Initial distributions of metastable antiprotonic 4He and 3He atoms over principal (n) and angular momentum (ℓ) quantum numbers have been deduced using laser spectroscopy experiments. The regions n=37–40 and n=35–38 in the two atoms account for almost all of the observed fractions [(3.0±0.1)% and (2.4±0.1)%] of antiprotons captured into metastable states.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.093401
DOI:
10.1103/PhysRevLett.89.093401
PACS:
36.10.–k, 25.43.+t, 34.90.+q
 
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