In 1998, Kajita's team at the Super-Kamiokande found that when cosmic rays hit the Earth's atmosphere, the resulting neutrinos switched between two flavours before they reached the detector under Mt.
I 1998 opdagede Kajitas forskergruppe i Super-Kamiokande, at når kosmisk stråling ramte Jordens atmosfære, så skiftede de opståede neutrinoer mellem to typer, før de nåede detektoren under Kamioka-bjerget.