The High-Altitude Water Cherenkov (HAWC) observatory is a second-generation continuously operated, wide field-of-view, TeV gamma-ray observatory. HAWC and its analysis techniques build on experience of the Milagro experiment in using ground-based water detectors for astronomy. located Sierra Negra volcano M\'exico at an elevation 4100 meters above sea level. completed principal detector consist...

We examine the sensitivity to ν µ → ν e of a conceptual experiment with a neutrino superbeam incident on a Megaton-scale water Cherenkov detector over a " magic " baseline ∼7300 km. With realistic beam intensity and exposure , the experiment may unambiguously probe sin 2 2θ 13 and the sign of ∆m 2 31 down to sin 2 2θ 13 ∼ 10 −3. Detecting the subdominant oscillation ν µ → ν e on the " atmospher...

To identify π and K in the region of 1.0 ∼ 2.5 GeV/c, a threshold Cherenkov counter equipped with silica aerogels has been investigated. Silica aerogels with a low refractive index of 1.013 have been successfully produced using a new technique. By making use of these aerogels as radiators, we have constructed a Cherenkov counter and have checked its properties in a test beam. The obtained resul...

Imaging air Cherenkov telescopes (IACTs) like MAGIC detect the Cherenkov light from extensive air showers (EAS) initiated by very high energy (VHE) γ-rays impinging on the Earth’s atmosphere. Due to the overwhelming background from hadron induced EAS, the discrimination of the rare γ-like events is vital. The influence of the geomagnetic field (GF) on the development of EAS can further complica...

Abstract Cosmic rays that strike the top of Earth’s atmosphere generate a shower secondary particles move toward surface with relativistic speeds. Water Cherenkov detectors (WCDs) on ground can detect charged muons, which are one many generated in shower, imaging technique. A large number these muons travel WCD tanks near speed light vacuum, faster than water, and so trigger isotropic radiation...