The search for solar neutrinos at Kamioka

Physics

Scientific paper

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6<=A<=19, Cherenkov Detectors

Scientific paper

The Kamiokande II1 collaboration upgraded the Kamioka nucleon decay experiment to allow a search for solar neutrinos. The 8B solar neutrinos are detected via neutrino-electron scattering yielding electrons above the Cherenkov threshold in water. The current threshold of 10 MeV gives an expected signal of 0.1 events/day, about an order of magnitude below the background. This background is due to a combination of uranium dissolved in the water, photons generated in the rock, and beta decays from long-lived isotopes caused by the breakup of 16O by cosmic ray muons traversing the detector. Each background can be reduced in the coming months and allow the threshold to be reduced to 7 MeV.

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