From the abyss of the Mediterranean Sea, scientists used the KM3NeT neutrino telescope to detect a cosmic neutrino with a record-breaking energy of about 220 PeV. The ARCA detector, part of the KM3NeT deep-sea observatory, captured this extraordinary event, named KM3-230213A, which is the most energetic neutrino ever observed.
This discovery provides the first evidence that neutrinos of such extreme energies are produced in the universe, a breakthrough now published in today’s issue of the journal Nature with the title Observation of an Ultra-High-Energy Cosmic Neutrino with KM3NeT. Read more.
Image: © The KM3NeT Collaboration; Visual impression of the ultra-high energy neutrino event observed in KM3NeT/ARCA. The colours indicate the light seen by the “eyes” on each module, where the different colours represent different observing times. The almost horizontally reconstructed track of the particle is shown as a line from left to right.