Trapping of negative kaons by metastable states during the atomic cascade in liquid helium

T. Yamazaki, M. Aoki, M. Iwasaki, R. S. Hayano, T. Ishikawa, H. Outa, E. Takada, H. Tamura, A. Sakaguchi

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Abstract

We observed two distinct peaks, 205-MeV/c - and 235-MeV/c -, associated with K2- and K2- decays at rest, respectively, from negative kaons stopped in liquid helium. These peaks were found to be delayed with respect to the stopping K-, showing that stopped K- mesons of about 2% fraction are trapped in metastable states with an overall lifetime of about 40 nsec. This observation provides a direct evidence for Condos trapping hypothesis for the at-rest decay components of K- and - in liquid helium.

Original languageEnglish
Pages (from-to)1590-1592
Number of pages3
JournalPhysical review letters
Volume63
Issue number15
DOIs
Publication statusPublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Yamazaki, T., Aoki, M., Iwasaki, M., Hayano, R. S., Ishikawa, T., Outa, H., Takada, E., Tamura, H., & Sakaguchi, A. (1989). Trapping of negative kaons by metastable states during the atomic cascade in liquid helium. Physical review letters, 63(15), 1590-1592. https://doi.org/10.1103/PhysRevLett.63.1590