The observation occurred just two hours after the lab’s accelerator complex switched to antineutrino delivery mode.

MINERvA measures the total probability that a muon neutrino (or antineutrino) interacts with the protons and neutrons inside the MINERvA detector via charged-current interaction.

The observation of the appearance of an electron neutrino proves conclusively that the NOvA experiment can measure electron neutrino appearance and confirms oscillations at greater than 3 sigma with primary analysis or 5 sigma with secondary analysis.