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IceTop — PeV Cosmic Rays at the South Pole
Stefan Klepser (DESY)
Seminar Room 3, 15:00
IceTop is a km²-scale air shower detector presently under construction as a part
of the IceCube Observatory at South Pole. It presently consists of 40 detector stations,
each equipped with two ice Cherenkov tanks, which cover 0.5 km². The detector is
designed to investigate the energy range from the knee up to about 1 EeV and study the
mass composition of primary cosmic rays.
In this talk, after a general introduction to the field, the performance of IceTop,
the development of shower reconstruction algorithms and first results obtained
with an array of 26 stations, installed in 2007, will be reported. Preliminary results are
presented for the cosmic ray energy spectrum in the range of 1 to 100 PeV. Being
located at an atmospheric depth of only 680 g/cm² at the altitude of the South Pole,
a high sensitivity of the zenith angle distribution to the mass composition is observed.
