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By measuring the neutrinosand their antimatter partners, antineutrinos, in both locations, physicists can study how these particles change their type as they travel, a phenomenon known as neutrino oscillation.

Sitting still, a muon decays into an electron, a neutrino, and an antineutrino in 2.2 microseconds.

For years it seemed like building a muon collider might be the only way to answer whether neutrinos behave differently than antineutrinos.

Some of the surviving electron antineutrinos will slam into a proton in the scintillator, producing an energetic positron that results in a flash of light.

Also present in this pool of particles were neutrinos, which are very tiny, weakly interacting particles, and antineutrinos, their antimatter counterparts.