Search for neutrino events in the Kamiokande-2 detector in correlation with the solar-flare activity in March 1989

Details Search for neutrino events in the Kamiokande-2 detector in correlation with the solar-flare activity in March 1989 Search for neutrino events in the Kamiokande-2 detector in correlation with the solar-flare activity in March 1989

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9030160h&link_type=abstract

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Physics

Cerenkov Counters, Neutrinos, Solar Flares, Cosmic Rays, Nuclear Capture, Sensitivity, Water

Scientific paper

A search was made for neutrino events (Ev greater than or approx. 50 MeV) in the Kamiokande-2 water Cherenkov detector in correlation with the great solar flare activity observed in March 1989. No evidence was obtained for such a correlation. Upper limits are separately given for the optical importance 4, 3, and 2 flares for both time integrated and time averaged solar flare (nue) fluxes at Ev = 50 MeV and 100 MeV. At Ev = 100 MeV, the 90 percent confidence-level upper limit for the time integrated (nue) flux per importance 4 (3) flare is 3.5 x 107 (1.4x107)/sq cm. Even the upper limit for the importance 4 flare is considerably lower than the (nue) flux at the corresponding energy needed to explain the excess neutrino captures reported in some of the (37)Cl experimental runs when large solar flares occurred. A search was also made for low energy events (recoil e(+ or -) energy greater than or approx. 10 MeV) in correlation with importance (greater than or =) 2 flares and with the solar proton flux (greater than or =) 10 MeV. Again, no significant signal was observed.

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