Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-09-03
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, 7 figures, Proceedings of the 31st ICRC, Lodz, Poland, July 2009
Scientific paper
Data from the IceCube detector in its 22-string configuration (IC22) were used to directly measure the atmospheric muon energy spectrum near the horizon. After passage through more than 10 km of ice, muon bundles from air showers are reduced to single muons, whose energy can be estimated from the total number of photons registered in the detector. The energy distribution obtained in this way is sensitive to the cosmic ray composition around the knee and is complementary to measurements by air shower arrays. The method described extends the physics potential of neutrino telescopes and can easily be applied in similar detectors. Presented is the result from the analysis of one month of IC22 data.
Berghaus Patrick
for the IceCube Collaboration
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