Search for day-night and semiannual variations in the solar neutrino flux observed in the Kamiokande-II detector

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

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

Searches for possible day-night and semiannual variations of the B8 solar neutrino flux are reported based on 1040 days of Kamiokande-II data. Within statistical error, no such short-time variations were observed. The limit on the day-night difference sets a constraint on neutrino-oscillation parameters. A region defined by sin22, >0.02 and 2×10-6m2-10-5 eV2 is excluded at 90% C.L. without any assumption on the absolute value of the expected solar neutrino flux.

Original languageEnglish
Pages (from-to)9-12
Number of pages4
JournalPhysical Review Letters
Volume66
Issue number1
DOIs
Publication statusPublished - 1991 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Hirata, K. S., Inoue, K., Kajita, T., Kihara, K., Nakahata, M., Nakamura, K., Ohara, S., Sato, N., Suzuki, Y., Totsuka, Y., Yaginuma, Y., Mori, M., Oyama, Y., Suzuki, A., Takahashi, K., Yamada, M., Koshiba, M., Nishijima, K., Suda, T., ... Zhang, W. (1991). Search for day-night and semiannual variations in the solar neutrino flux observed in the Kamiokande-II detector. Physical Review Letters, 66(1), 9-12. https://doi.org/10.1103/PhysRevLett.66.9