Results from one thousand days of real-time, directional solar-neutrino data

K. S. Hirata, K. Inoue, T. Kajita, T. Kifune, 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, 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 journalArticlepeer-review

330 Citations (Scopus)


A data sample of 1040 days from the Kamiokande II detector, consisting of subsamples of 450 days at electron-energy threshold 9.3 MeV and 590 days at 7.5 MeV, yields a clear directional correlation of the solar-neutrino-induced electron events with respect to the Sun and a measurement of the differential electron-energy distribution. These provide unequivocal evidence for the production of B8 by fusion in the Sun. The measured flux of B8 solar neutrinos from the two subsamples relative to a prediction of the standard solar model is 0.46±0.05(stat)±0.06(syst). The total data sample is tested for short-term time variation; within the statistical error, no significant variation is observed.

Original languageEnglish
Pages (from-to)1297-1300
Number of pages4
JournalPhysical review letters
Issue number11
Publication statusPublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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