Consider a large water Cherenkov detector for solar neutrinos. The electron neutrinos are detected by the reaction

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Consider a large water Cherenkov detector for solar neutrinos. The electron neutrinos are detected by the reaction ve + e- → ve + e-. Assume the cross-section (at about 10 MeV) σ = 10-47 m2 and the incident flux in the energy range above threshold Φ =1010m-2s-1. What is the water mass in which the interaction rate is 10 events a day if the detection efficiency is ε = 50%?

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