A naturally occurring trap for antiprotons

J. Eades, N. Morita, T. M. Ito, Y. Ito, A. Kawachi, S. N. Nakamura, R. S. Hayano, M. Iwasaki, K. Shigaki, H. Tamura, I. Sugai, E. Widmann, T. Yamazaki, W. Higemoto, N. Nishida, F. J. Hartmann, H. Daniel, T. von Egidy, P. Hofmann, Y. S. Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The phenomenon of delayed annihilation of antiprotons in helium is the first instance of a naturally occurring trap for antimatter in ordinary matter. Recent studies of this effect at CERN are summarised, and plans are described for laser excitation experiments to test its interpretation in terms of metastable exotic helium atom formation.

Original languageEnglish
Pages (from-to)227-237
Number of pages11
JournalHyperfine Interactions
Issue number1-4
Publication statusPublished - 1993 Mar


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