| Autor: |
M. Takita, W. Frati, K. Nishijima, Kunio Inoue, F.M. Newcomer, Toru Tanimori, L. R. Feldscher, K. S. Hirata, M. Koshiba, E. Kodera, K. Kaneyuki, K. Nakamura, Y. Yaginuma, Takanori Ishida, Kazumasa Miyano, S. B. Kim, S. Ohara, Y. Nagashima, E. W. Beier, Y. Oyama, Y. Fukuda, Weiya Zhang, A.K. Mann, A. Suzuki, T. Tajima, R. Van Berg, K. Takahashi, Miho Yamada, Masayuki Nakahata, T. Suda, K. Kihara, Y. Totsuka, Masaki Mori, E. D. Frank, H. Takei, Yasunari Suzuki, H. Miyata, Nobuaki Sato, Takaaki Kajita |
| Rok vydání: |
1991 |
| Předmět: |
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| Zdroj: |
Physical Review D. 44:2241-2260 |
| ISSN: |
0556-2821 |
| Popis: |
The method of $^{8}\mathrm{B}$ solar-neutrino measurement by means of the reaction ${\ensuremath{\nu}}_{e}e\ensuremath{\rightarrow}{\ensuremath{\nu}}_{e}e$ in the Kamiokande II detector is described in detail. A data sample of 1040 live detector days in the time period January 1987 through April 1990 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. The measured flux of $^{8}\mathrm{B}$ solar neutrinos from the subsamples of 450 days at electron energy threshold ${E}_{e}\ensuremath{\ge}9.3$ MeV, and 590 days at ${E}_{e}\ensuremath{\ge}7.5$ MeV relative to calculations of the $^{8}\mathrm{B}$ flux based on the standard solar model are 0.46\ifmmode\pm\else\textpm\fi{}0.05(stat)\ifmmode\pm\else\textpm\fi{}0.06(syst) times the prediction of Bahcall and Ulrich, and 0.70\ifmmode\pm\else\textpm\fi{}0.08(stat)\ifmmode\pm\else\textpm\fi{}0.09(syst) times the prediction of Turck-Chi\`eze et al. The shape of the recoil electron energy distribution is consistent with that expected from the product of the known shape of the neutrino flux from $^{8}\mathrm{B}$ $\ensuremath{\beta}$ decay and the cross section for ${\ensuremath{\nu}}_{e}e\ensuremath{\rightarrow}{\ensuremath{\nu}}_{e}e$ scattering. Within the statistical error, there is no evidence in the solar-neutrino signal for a significant time variation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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