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Phys. Rev. A 70, 012501 (2004) [5 pages]

Systematic study of the decay rates of antiprotonic helium states

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H. Yamaguchi *, R. S. Hayano, T. Ishikawa, J. Sakaguchi, and E. Widmann
Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

J. Eades and M. Hori
CERN, CH-1211 Geneva 23, Switzerland

H. A. Torii
Institute of Physics, University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8902, Japan

B. Juhász
Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary

D. Horváth
KFKI Research Institute For Particle and Nuclear Physics, H-1525 Budapest, Hungary

T. Yamazaki
RI Beam Science Laboratory, RIKEN, Wako, Saitama 351-0198, Japan

Received 19 January 2004; published 8 July 2004

A systematic study of the decay rates of antiprotonic helium ( p̅ 4He+ and p̅ 3He+ ) at CERN Antiproton Decelerator has been made by a laser spectroscopic method. The decay rates of some of its short-lived states, namely those for which the Auger rates γA are much larger than their radiative decay rates (γrad∼1  μs−1) , were determined from the time distributions of the antiproton annihilation signals induced by laser beams, and the widths of the atomic resonance lines. The magnitude of the decay rates, especially their relation with the transition multipolarity, is discussed and compared with theoretical calculations.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.70.012501
DOI: 10.1103/PhysRevA.70.012501
PACS: 36.10.−k, 32.80.Dz

* Present address: Center for Nuclear Study (CNS), University of Tokyo, RIKEN Campus, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

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