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J. Phys.: Conf. Ser. 65 (2007) 012022 (7pp)   doi: 10.1088/1742-6596/65/1/012022

A giant natural TPC (500 km)3 to observe extremely high energy cosmic particles - JEM EUSO telescope on International Space Station


Y Takahashi1,2
1 Department of Physics, The University of Alabama in Huntsville, Huntsville, AL35899, USA
2 Computational Astrophysics Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi, Japan
E-mail: yoshi@cosmic.uah.edu

Abstract. An idea of a remote sensing, Time Projection Chamber (TPC) kind of detector can be found in the planned cosmic ray experiments, Extreme Universe Space Observatory (EUSO). It uses a huge volume of earth's night sky in which an extremely energetic cosmic ray particle (E > 1019 eV) generates a straight-line N2 fluorescence signals of a track of cascade shower moving at the speed of light for a length of 10 - 100 km depending on the incident angle. The space-time resolved calorimetry of showers is designed with a large-aperture Fresnel lens optics and a large-area focal surface of detectors. Such a system in space is capable of detecting thousands of events with energy above 1020 eV (> 1000 super-LHC) in a few years of operation on orbit, allowing a particle channel of astronomy and a research of fundamental physics in universe. Neutrino interaction cross-section at such high energies is expected to increase in the Standard Model, and EUSO expects a reasonable chance of observing the cosmogenic neutrino events among those detectable showers, because the atmospheric target mass of the EUSO TPC exceeds 1 trillion tons. This experiment JEM-EUSO is currently considered by the Japan Aerospace Exploration Agency (JAXA) for a possible payload on the Japan Experiment Module (JEM) of the International Space Station (ISS).

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