SOLAR NEUTRINO DATA COVERING SOLAR CYCLE 22

Results from 1036 days of solar neutrino data accumulated in the upgraded Kamiokande detector (Kamiokande III) are presented. The B8 solar neutrino flux observed in Kamiokande III is 2.82−0.24+0.25 (stat) ± 0.27 (syst) × 106 cm−2s−1; the combined flux from Kamiokande II and III (2079 days in total) is 2.80 ± 0.19 (stat) ± 0.33 (syst) × 106 cm−2s−1, which is 49% to 64% of the standard solar models. These combined data from January 1987 to February 1995, covering an entire period of solar cycle 22, enabled us to study a correlation between the neutrino flux and the solar activity in detail: no strong correlation of the solar neutrino flux with the sunspot numbers was found within experimental errors. The result on a search for the daytime and nighttime flux difference is also reported.