First Detection of Photons with Energy beyond 100 TeV from an Astrophysical Source
First Detection of Photons with Energy beyond 100 TeV from an Astrophysical Source
We report on the highest energy photons from the Crab Nebula observed by the Tibet air shower array with the underground water-Cherenkov-type muon detector array. Based on the criterion of a muon number measured in an air shower, we successfully suppress 99.92% of the cosmic-ray background events with energies E>100 …