Speaker
Description
Telescope Array (TA) is the largest cosmic ray detector in the Northern hemisphere, constructed to study ultra high energy cosmic rays (UHECRs) with energies above 10^18 eV. The TA consists of an array of scintillation counters with 1200 m spacing and three fluorescence detectors, each viewing 3 to 30 degrees in elevation. The TA has also added a facility (TALE) to extend the energy threshold down to 10^15.8 eV, by addition of 10 additional fluorescence telescopes increasing the elevation angle up to 59 degrees, and an infill array of plastic scintillation counters with spacing of 400 and 600 m. The TA has accumulated a large UHECR data set which allows us to determine the energy spectrum and chemical composition of the primary particles, and search for anisotropy of UHECR arrival directions and thus sources of cosmic rays. We discuss findings with the latest data about the localized excess of events known as the TA "hotspot". The experiment and its most recent measurements - spectrum, composition, and anisotropy - will be presented.
