The Most Energetic Neutrino Ever Detected
Have you ever thought about catching a raindrop and realizing it came from a storm on the other side of the Universe? Well, on 13 February 2023, something equally incredible happened when a detector submerged in the Mediterranean Sea picked up a neutrino with a staggering energy of around 220 PeV, shattering the previous record by more than ten times.
Neutrinos are intriguing particles that are often referred to as the ghost particles of the Universe. They are nearly massless, electrically neutral, and interact very weakly with matter. In fact, billions of neutrinos pass through your body without you even noticing.
The detection of such an ultra-high-energy neutrino required the use of the KM3NeT/ARCA detector, located on the seabed off the coast of Sicily, utilizing the Mediterranean Sea as a medium for detection.
The signal from this neutrino event puzzled physicists as it did not match any known events. To solve this mystery, the KM3NeT collaboration conducted simulations and formulated hypotheses until they found a plausible explanation.
Their investigation led them to consider blazars, which are active galactic nuclei with supermassive black holes at their core emitting jets of plasma at near-light speeds. Blazars are known for their extreme brightness and orientation, making them one of the most luminous objects in the sky.
The team’s simulations of a population of blazars and their neutrino flux predictions align with the observed data from KM3NeT, IceCube, and the Fermi Gamma-ray Space Telescope. Additionally, the absence of an electromagnetic counterpart during the event suggests a diffuse background of extreme energy particles rather than a single source.
The detection occurred with only 21 detection lines operating on KM3NeT, indicating the potential for more significant discoveries with the complete detector in operation. As the investigation continues, blazars remain the primary focus, potentially reshaping our understanding of the Universe’s most extreme phenomena.
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This article was originally published by Universe Today. Read the original article.
