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Exotic particles called neutrinos have been caught in the act of shape-shifting, switching from one flavor to another, in a discovery that could help solve the mystery of antimatter.

Neutrinos come in three flavors — electron, muon and tau — and have been known to change, or oscillate, between certain flavors. Now, for the first time, scientists can definitively say they’ve discovered muon neutrinos changing into electron neutrinos.

The discovery was made at the T2K neutrino experiment in Japan, where scientists sent a beam of muon neutrinos from the J-PARC laboratory in Tokai Village on the eastern coast of Japan, streaming 183 miles (295 km) away to the Super-Kamiokande neutrino detector in the mountains of Japan’s northwest.

The researchers detected an average of 22.5 electron neutrinos in the beam that reached the Super-Kamiokande detector, suggesting a certain portion of the the muon neutrinos had oscillated into electron neutrinos; if no oscillation had occurred, the researchers should have detected just 6.4 electron neutrinos.

Strange Particles Shape-Shift From One Flavor to Another

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