Recent results of the short-basline neutrino oscillation experiments suggest the existence of the forth-generation neutrino in addition to the known neutrinos of electron-type, muon-type and tau-type. This hypothetical neutrino is called "sterile" neutrino, because it does not interact with the ordinary weak bosons, and appears only in the neutrino oscillation. The sterile neutrino is interesting because it is a candidate of the cosmic dark matter and the right-handed neutrino.

Our group take a part in the international collaboration experiment JSNS^2 (spokesperson; Prof. Takasumi Maruyama (KEK)) which is going to make a high-precision measurement of the neutrino oscillation using an intense neutrino beam from the J-PARC spallation neutron source and the liquid scintillation detectors with total weight of 50 tons. For detail, please visit JSNS^2 web site.