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ICARUS gets ready to fly | US Department of Energy Science News

DOE/Fermi National Accelerator Laboratory The ICARUS detector has been collecting test data in preparation for the official start of the physics data collection later this year. The left panel shows an electron neutrino interaction that produced a proton (top track) and an electron, which produced an electromagnetic shower with photons and electrons (bottom tracks). The right panel shows a muon neutrino interaction that produced a proton (short track, top left) and a muon (3.4-meter-long track); a cosmic-ray track independent of the muon neutrino interaction is also visible in the lower half of the image. In both panels, the neutrino beam came from left. (Image: ICARUS collaboration)

Which neutrino is the heaviest?

Illustration by Sandbox Studio, Chicago with Corinne Mucha Which neutrino is the heaviest? 05/13/21 By Scott Hershberger The question may seem simple, but physicists don’t yet know the answer. New measurements aim to change that. Neutrinos are the featherweights of the subatomic world. These extremely plentiful, rarely interacting particles are at least 500,000 times lighter than electrons. They are produced in the sun, in exploding stars, and in decay processes on Earth even ones in your own body. But they interact so infrequently with other matter that you’d hardly know there are so many of them around. For decades physicists thought these ghostly particles were massless. But experiments revealed that neutrinos do have mass. In fact, there are three types of neutrinos and three different masses. 

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