More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The "Glashow resonanceLinks to an external site." phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what's produced in the most powerful colliders on Earth.                        What is the threshold antineutrino energy for the Glashow resonance in peta electronvolts (PeV)?

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More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The "Glashow resonanceLinks to an external site." phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what's produced in the most powerful colliders on Earth.                        What is the threshold antineutrino energy for the Glashow resonance in peta electronvolts (PeV)?

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