Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploration of a 100 TeV gamma-ray northern sky using the Tibet
  air-shower array combined with an underground water-Cherenkov muon-detector
  array   Aiming to observe cosmic gamma rays in the 10 - 1000 TeV energy region, we
propose a 10000 m^2 underground water-Cherenkov muon-detector (MD) array that
operates in conjunction with the Tibet air-shower (AS) array. Significant
improvement is expected in the sensitivity of the Tibet AS array towards
celestial gamma-ray signals above 10 TeV by utilizing the fact that
gamma-ray-induced air showers contain far fewer muons compared with
cosmic-ray-induced ones. We carried out detailed Monte Carlo simulations to
assess the attainable sensitivity of the Tibet AS+MD array towards celestial
TeV gamma-ray signals. Based on the simulation results, the Tibet AS+MD array
will be able to reject 99.99% of background events at 100 TeV, with 83% of
gamma-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 TeV
gamma-ray sources and the cutoffs of their energy spectra. Furthermore, the
Tibet AS+MD array, along with imaging atmospheric Cherenkov telescopes as well
as the Fermi Gamma-ray Space Telescope and X-ray satellites such as Suzaku and
MAXI, will make multiwavelength observations and conduct morphological studies
on sources in the quest for evidence of the hadronic nature of the cosmic-ray
acceleration mechanism.

1
The categories of this paper are: cs
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg