Wednesday, May 15, 2013

Recommended by us:"First evidence for extraterrestrial sources of high-energy neutrinos"

IceCube Neutrino Observatory reports first evidence for extraterrestrial sources of high-energy neutrinos

A massive telescope in the Antarctic ice reports the detection of 28 extremely high-energy neutrinos that might have their origin in cosmic sources. Two of these reached energies greater than 1 petaelectronvolt (PeV), an energy level thousands of times higher than the highest energy neutrino yet produced in a manmade accelerator.
Photo: Francis Halzen
Francis Halzen

The IceCube Neutrino Observatory, run by an international collaboration and headquartered at the Wisconsin IceCube Particle Astrophysics Center (WIPAC) at the University of Wisconsin–Madison, identified the neutrinos, which were described today (May 15) in a talk at the IceCube Particle Astrophysics Symposium at UW–Madison.
“We’re looking for the first time at high energy neutrinos that are not coming from the atmosphere,” says Francis Halzen, principal investigator of IceCube and the Hilldale and Gregory Breit Distinguished Professor of Physics at UW–Madison. “This is what we were looking for,” he adds. “I would never have imagined that the science would be more exciting than building this instrument.”


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