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Phys. Rev. Lett. 67, 1246–1249 (1991)

Discovery of antiproton trapping by long-lived metastable states in liquid helium

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M. Iwasaki, S. N. Nakamura, K. Shigaki, Y. Shimizu, H. Tamura, T. Ishikawa, and R. S. Hayano
Department of Physics and Meson Science Laboratory, Faculty of Science, University of Tokyo, Tokyo 113, Japan

E. Takada
National Institute of Radiological Sciences, Chiba 260, Japan

E. Widmann, H. Outa, M. Aoki, P. Kitching, and T. Yamazaki
Institute for Nuclear Study, University of Tokyo, Tokyo 188, Japan

Received 20 May 1991; published in the issue dated 2 September 1991

Delayed annihilation of antiprotons stopped in liquid helium has been observed, revealing that about 3.6% of stopped antiprotons are trapped in long-lived metastable states. No delayed component was found either in liquid nitrogen or in liquid argon. The observed time distribution of delayed annihilation shows fast-decaying components followed by a major part with a decay time constant of 3 μsec.

© 1991 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.1246
DOI:
10.1103/PhysRevLett.67.1246
PACS:
36.10.-k
 
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