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The Tibet experiment, operating at Yangbajing (4300 m above sea level), is the lowest energy air shower array, and the new high-density array constructed in 1996 is sensitive to gamma-ray air showers at energies as low as 3 TeV. With this new array, the Crab Nebula was observed in multi-TeV gamma-rays and a signal was detected at the 5.5 sigma level. We also obtained the energy spectrum of gamma-rays in the energy region above 3 TeV which partially overlaps those observed with imaging atmospheric Cerenkov telescopes. The Crab spectrum observed in this energy region can be represented by the power-law fit dJ&amp;parl0;E&amp;parr0;&amp;solm0;dE=&amp;parl0;4.61+/-0.90&amp;parr0;x10-12&amp;parl0;E&amp;solm0;3 TeV&amp;parr0;-2.62+/-0.17 cm-2 s-1 TeV-1. This is the first observation of gamma-ray signals from point sources with a conventional air shower array using scintillation detectors.

Observation of Multi-T[CLC]e[/CLC]V Gamma Rays from the Crab Nebula using the Tibet Air Shower Array