KM3NeT Records 220 PeV Neutrino, 20 Times Above Previous Record
Updated
Updated · spacedaily.com · Jun 2
KM3NeT Records 220 PeV Neutrino, 20 Times Above Previous Record
2 articles · Updated · spacedaily.com · Jun 2
KM3-230213A, detected by KM3NeT/ARCA off Sicily in February 2023, remains the highest-energy neutrino ever recorded at about 220 petaelectronvolts, far above IceCube’s previous roughly 10 PeV record.
A February 2026 Physical Review Letters paper says a population of blazars could plausibly produce such an event, using hadronic models that match KM3NeT and IceCube neutrino data without overshooting Fermi’s measured gamma-ray background.
No electromagnetic counterpart was found near the event’s direction, pushing researchers toward a diffuse origin from many distant blazars rather than a single flaring source, though no specific source has been confirmed.
IceCube’s failure to see a comparable event remains a key constraint: the tension is estimated at about 2 to 3.5 sigma, and the blazar explanation works only within a narrow parameter range.
KM3NeT was operating at about 10% of its planned size when the event hit; upgrades aim to sharpen pointing from 1.5 degrees to 0.1 degrees and enable rapid alerts for future follow-up.
Will the mystery of the record-breaking neutrino be solved by detectors in the deep sea or the ice at the South Pole?
Could the universe's most powerful 'ghost particle' be our first real evidence for physics beyond the Standard Model?
Record-Breaking 220 PeV Neutrino Detected by KM3NeT: New Frontiers in Cosmic Particle Physics and Astronomy
Overview
On February 13, 2023, the KM3NeT Collaboration made a groundbreaking discovery by detecting KM3-230213A, the highest-energy neutrino ever observed at about 220 PeV. This event, captured by the advanced ARCA detector in the Mediterranean Sea, marks a major leap in neutrino astronomy. The immense energy and precise path of KM3-230213A strongly point to a cosmic origin, far beyond our solar system. This detection not only showcases the sophisticated capabilities of the KM3NeT system but also opens new possibilities for understanding the universe’s most extreme and energetic phenomena.