Consider a large water Cherenkov detector for solar neutrinos The electron neutrinos are detected by the reaction v e e v e e Assume the cross section (at about 10 MeV) 10 47 m 2 and the incident flux in the energy range above threshold 10 10 m 2 s 1 What is the water mass in which the interaction rate is 10 events a day if the detection efficiency is 50

Question: Consider a large water Cherenkov detector for solar neutrinos. The electron neutrinos are detected by the reaction v e + e - v e

Consider a large water Cherenkov detector for solar neutrinos. The electron neutrinos are detected by the reaction v_e + e^- → v_e + 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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