A neutrino is a tiny, neutral subatomic particle with a very small mass, much less than that of an electron. It comes in three types: electron neutrinos, muon neutrinos, and tau neutrinos. Neutrinos interact very weakly with other matter, allowing them to pass through most objects almost undetected. They are produced in various nuclear reactions, such as those in the sun, during supernovae, and in nuclear reactors. Despite their elusive nature, neutrinos are essential for understanding fundamental processes in the universe.
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| This artist's impression shows part of the KM3NET neutrino detector, being built deep in the Mediterranean Sea. It's not to scale — the detector units are just 30 cm across, and they'll be spread across cubic kilometers under the sea. |
On February 13, 2023, the Astroparticle Research with Cosmics in the Abyss (ARCA) picked up a single muon that triggered more than a third of the site’s intricate sensors. The inbound trajectory of the muon, coupled with its extremely high energy, led KM3NeT researchers to conclude that the muon was the result of a 220 peta electrovolt (PeV) neutrino striking the Earth's atmosphere from space.
See the complete article at SkyandTelescope
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