First Evidence for Extraterrestrial High-Energy Neutrinos
A massive telescope in the Antarctic ice has reported the detection of 28 extremely high-energy neutrinos that might have their origin in cosmic sources. Two of these reached energies greater than one petaelectronvolt (PeV), an energy level thousands of times higher than the highest energy neutrino yet produced in a manmade accelerator.
The IceCube Neutrino Observatory, run by an international collaboration and headquartered at the Wisconsin IceCube Particle Astrophysics Center (WIPAC) at the Univ. of Wisconsin–Madison, identified the neutrinos, which were described in a talk at the IceCube Particle Astrophysics Symposium at UW–Madison.
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