| アブストラクト: |
By separating tau conversion from tau-shower generation, the Earth-skimming
nu_tau method allows for huge target mass and detection volume simultaneously.
An attempt by NuTel a decade ago was limited by acceptance, but Ashra-1
demonstrated the feasibility. The recent IceCube observation of PeV
astro-neutrinos makes the scientific case compelling. The planned NTA
observatory will have 3+1 site stations watching the air mass between Mauna
Loa, Mauna Kea, and Hualalai on Hawaii Island, with central station watching
the night sky. Sensitivity is > 100 km^3 water equivalent, with pointing
accuracy < 0.2 deg, achieved with Cherenkov-fluorescence stereoscopic
observation for PeV-EeV neutrinos that is almost background-free. With
design based on Ashra-1 experience, and the goal of clear discovery and
identification of astronomical nu_tau sources, a new international
collaboration is beginning to form. |
