Yoshiki Tsunesada, for the Telescope Array Collaboration
The results from the first three years observation in Telescope Array are
reviewed. The energy spectrum, mass composition, and anisotropy in arrival
directions of ultra-high energy cosmic rays are discussed. The energy spectrum
of cosmic rays with energies above $10^{18}$ eV is determined using the data of
the fluorescence detectors, surface detectors, and with a hybrid shower
reconstruction technique using the both data. The ankle structure is clearly
found at $10^{18.7}$ eV. The second bending point is also identified, at which
the flux of cosmic rays begins to decrease and the spectral index changes from
$E^{-2.68}$ to $E^{-4.2}$. The study of shower development using the
fluorescence detector data shows that proton is dominant in cosmic rays above
$10^{18.2}$ eV. No apparent anisotropies in the arrival direction of cosmic
rays are found. I also present further experimental extensions which are being
developed at the Telescope Array site.
View original:
http://arxiv.org/abs/1111.2507
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