NEUTRINO ANOMALY IN THE ATMOSPHERE
Atmospheric neutrinos, which are produced when cosmic rays collide with particles in our atmosphere, were discovered by the Kamiokande team in Japan and the IMB (Irvine, Michigan, Brookhaven) collaboration in the United States. The experiments discovered a lower ratio of muon neutrinos to electron neutrinos than expected, echoing the solar neutrino problem. The “atmospheric neutrino anomaly” was coined to describe this phenomenon.