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Aiming to observe cosmic gamma rays in the 10 - 1000 TeV energy region, wepropose a 10000 m^2 underground water-Cherenkov muon-detector (MD) array thatoperates in conjunction with the Tibet air-shower (AS) array. Significantimprovement is expected in the sensitivity of the Tibet AS array towardscelestial gamma-ray signals above 10 TeV by utilizing the fact thatgamma-ray-induced air showers contain far fewer muons compared withcosmic-ray-induced ones. We carried out detailed Monte Carlo simulations toassess the attainable sensitivity of the Tibet AS+MD array towards celestialTeV gamma-ray signals. Based on the simulation results, the Tibet AS+MD arraywill be able to reject 99.99% of background events at 100 TeV, with 83% ofgamma-ray events remaining. The sensitivity of the Tibet AS+MD array will be~20 times better than that of the present Tibet AS array around 20 - 100 TeV.The Tibet AS+MD array will measure the directions of the celestial TeVgamma-ray sources and the cutoffs of their energy spectra. Furthermore, theTibet AS+MD array, along with imaging atmospheric Cherenkov telescopes as wellas the Fermi Gamma-ray Space Telescope and X-ray satellites such as Suzaku andMAXI, will make multiwavelength observations and conduct morphological studieson sources in the quest for evidence of the hadronic nature of the cosmic-rayacceleration mechanism.

Exploration of a 100 TeV gamma-ray northern sky using the Tibet air-shower array combined with an underground water-Cherenkov muon-detector array