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Measurement of Cosmic Ray Energy Spectrum with IceCube

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Bakhtiyar Ruzybayev, University of Delaware
28 October 2013 from 4:00 PM to 5:30 PM
320 Whitmore Lab
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IceCube is a unique 3 dimensional cosmic ray detector that can measure cosmic ray initiated air showers. Results of two different techniques will be presented. The first result is a measurement of the all-particle cosmic ray energy spectrum in the energy range from 1.58 PeV to 1.26 EeV using the IceTop air shower array, which is the surface component of the IceCube Neutrino Observatory at the South Pole. The second result is a measurement of both cosmic ray energy spectrum and composition using neural network techniques and the full IceCube as a 3-dimensional cosmic ray detector. The measured energy spectrum exhibits clear deviations from a single power law above the knee around 4 PeV and below 1 EeV. In addition, the observed mean logarithmic mass is increasing up to at least 100 PeV.