Cherenkov τ shower earth-skimming method for PeV-EeV ντ observation with Ashra

被引：22

作者：

Asaoka, Yoichi ^{[1
]}

Sasaki, Makoto ^{[1
]}

机构：

[1] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

来源：

ASTROPARTICLE PHYSICS | 2013年 / 41卷

关键词：

High-energy neutrinos; Earth-skimming tau neutrino; Cherenkov images; Ashra; CORSIKA; GEANT4; Monte Carlo simulation; GAMMA-RAY BURSTS; HIGH-ENERGY NEUTRINOS; MUON NEUTRINOS; AIR-SHOWERS; COSMIC-RAYS; SEARCH;

D O I：

10.1016/j.astropartphys.2012.10.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe a method of observation for PeV EeV tau neutrinos using Cherenkov light from the air showers of decayed tau s produced by tau neutrino interactions in the Earth. Aiming for the realization of neutrino astronomy utilizing the Earth-skimming tau neutrino detection technique, highly precise determination of arrival direction is key due to the following issues: (1) clear identification of neutrinos by identifying those vertices originating within the Earth's surface and (2) identification of very high energy neutrino sources. The Ashra detector uses newly developed light collectors which realize both a 42 degrees-diameter field-of-view and arcminute resolution. Therefore, it has superior angular resolution for imaging Cherenkov air showers. In this paper, we estimate the sensitivity of and cosmic-ray background resulting from application of the Ashra-1 Cherenkov tau shower observation method. Both data from a commissioning run and a long-term observation (with fully equipped trigger system and one light collector) are presented. Our estimates are based on a detailed Monte Carlo simulation which describes all relevant shower processes from neutrino interaction to Cherenkov photon detection produced by tau air showers. In addition, the potential to determine the arrival direction of Cherenkov showers is evaluated by using the maximum likelihood method. We conclude that the Ashra-1 detector is a unique probe into detection of very high energy neutrinos and their accelerators. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：7 / 16

页数：10

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