The KEK-to-Kamioka long-baseline neutrino experiment (K2K) has begun its investigation of neutrino oscillation, and has established the method of a long-baseline neutrino experiment. From the first 100 days of data-taking, a deficit of muon neutrino in the 1-GeV energy region after 250-km flight was observed at the 90% significance level.
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Takanobu Ishii (2001) studied this question.