Prof. George W.S. Hou (National Taiwan University)
The recent IceCube astrophysical PeV neutrino events motivate the planning of the Neutrino Telescope Array (NTA) observatory, which will have three site stations watching the air mass surrounded by Mauna Loa, Mauna Kea, and Hualalai on Hawaii Big Island, plus a site station at the center watching the lower night sky. By separating nu_tau -> tau conversion from tau-shower generation, the Earth-skimming nu_tau method allows for huge target mass and detection volume simultaneously. With the mountains both as target and shield, this method for PeV-EeV neutrino search is almost background-free. With design based on experience from the operating Ashra-1 detector, sensitivities reaching beyond 100 cubic-km water equivalent can be achieved with Cherenkov-fluorescence stereoscopic observation, with pointing accuracy of 0.2 deg or less. With the goal of clear discovery and identification of astronomical nu_tau sources achievable, a new International Collaboration is called for to probe such cosmic proton accelerators.
Talk based on arXiv:1408.6244 [astro-ph.IM], a Letter of Intent for the NTA observatory.