Observation of a small atmospheric vμ/ve ratio in Kamiokande

K. S. Hirata, K. Inoue, T. Ishida, T. Kajita, K. Kihara, M. Nakahata, K. Nakamura, S. Ohara, A. Sakai, N. Sato, Y. Suzuki, Y. Totsuka, Y. Yaginuma, M. Mori, Y. Oyama, A. Suzuki, K. Takahashi, M. Yamada, M. Koshiba, K. NishijimaT. Kajimura, T. Suda, T. Tajima, K. Miyano, H. Miyata, H. Takei, Y. Fukuda, E. Kodera, Y. Nagashima, M. Takita, H. Yokoyama, K. Kaneyuki, Y. Takeuchi, T. Tanimori, E. W. Beier, E. D. Frank, W. Frati, S. B. Kim, A. K. Mann, F. M. Newcomer, R. Van Berg, W. Zhang

Research output: Contribution to journalArticlepeer-review

642 Citations (Scopus)


Results are presented of the observation of atmospheric neutrino interactions in the Kamiokande detector in an exposure of 4.92 kt yr. The observed ratio of single ring μ-events to e-events ( μ e)data ( μ e)MC = 0.60+007-0.06 (stat.) ± 0.05 (syst.) suggests that the atmospheric vμ/ve ratio is smaller than expected. The implications of these results for neutrino oscillations are discussed.

Original languageEnglish
Pages (from-to)146-152
Number of pages7
JournalPhysics Letters B
Issue number1-2
Publication statusPublished - 1992 Apr 23
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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