316 research outputs found
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.Comment: Accepted by Astroparticle Physic
Primary cosmic-ray proton and helium spectra at the knee energy region measured by the Tibet hybrid AS experiment
The energy spectrum of the light components (P+He) at the knee obtained by the Tibet air shower core detector
Absolute Energy Scale Calibration of Multi-TeV Cosmic Rays Using the Moon's Shadow Observed by the Tibet Air Shower Array
Sun's Shadow Variation During the Recent Solar Cycle 23 Observed with the Tibet Air Shower Array
Search for steady PeV gamma-ray emission from the Monogem Ring with the Tibet air shower array
Two dimensional observation on TeV Cosmic-ray large scale anisotropy using the Tibet Air Shower Array
New Flux Upper Limits of Diffuse TeV Gamma Rays from the Galactic Plane Observed with the Tibet Air Shower Array
- …