An accelerator-based neutrino beam experiment with a baseline of several hundred kilometers is design to study neutrino oscillations discovered in atmospheric neutrinos. The K2K experiment in Japan is the first accelerator based long-baseline experiment and successfully confirmed atmospheric neutrino oscillations with an artificial neutrino beam. The T2K experiment has the higher power and higher quality of the muon neutrino beam, and finds the evidence of the third neutrino oscillation, appearance of electron neutrinos first in the world. We report the history, status and the future prospect of the accelerator neutrino oscillation experiments.
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