Present and future neutrino oscillation experiments in Japan

Abstract

Present status of the long base-line neutrino oscillation experiment(KEKPS-E362) and future plan are described. With 10 20 protons on target from 12 GeV KEK-PS, the experiment can observe neutrino oscillation with more than 3σ effect for Δ m 2 ≥ 2 × 10 −3 eV 2 and sin 2 θ ≥ 0.4 in the ν μ disappearance channel, and Δ m 2 ≥ 3 × 10 −3 eV 2, sin 2 2 θ ≥ 0.1 in the ν μ → ν e appearance channel. The next step of the program will be the identification of ν τ . A preliminary study indicates it is possible to identify τ production in water Cherenkov detector.