G. W.-S. Hou and M. Sasaki, ICRC2015

Neutrino Telescope Array (NTA): Prospect towards Survey of Astronomical ντ Sources

George Wei-Shu Hou∗ Department of Physics, National Taiwan University, Taipei 10617, Taiwan E-mail: wshou@phys.ntu.edu.tw

Makoto Sasaki Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan E-mail: sasakim@icrr.u-tokyo.ac.jp

The recent observation of astrophysical PeV neutrino events by IceCube opens a new chapter in neutrino astronomy, calling for improved point-back abilities and increased sensitivity to fill the gap between IceCube and Auger and probe for PeV–EeV neutrino point sources. By separating ντ → τ conversion from τ-shower generation, the Earth-skimming ντ method allows for huge target mass and detection volume simultaneously. The Ashra-1 detector, in operation up Mauna Loa on Hawaii Big Island, has demonstrated the feasibility in a 1st search for ντ from a GRB. With design based on this experience, a Neutrino Telescope Array (NTA) observatory is being planned: it will have three site stations watching the air mass surrounded by Mauna Loa, Mauna Kea, and Hualalai, plus a central site station watching the lower night sky. Sensitivities equivalent to > 100 km3 water and pointing accuracy of < 0.2 ◦ can be achieved with Cherenkov-fluorescence stereoscopic observation for PeV–EeV neutrinos that is almost background-free. With the scientific goal of clear discovery and identification of astronomical ντ sources, a new International Collaboration is being formed to probe for cosmic proton accelerators. The 34th International Cosmic Ray Conference, 30 July- 6 August, 2015 The Hague, The Netherlands

The 34th International Cosmic Ray Conference, 30 July- 6 August, 2015 The Hague, The Netherlands

http://pos.sissa.it/archive/conferences/236/1167/ICRC2015_1167.pdf