Using 2010 to 2013 IceTop and IceCube data, the collaboration reports a cosmic ray spectrum that hardens near 20 PeV and softens above 100 PeV, with heavier elements keeping harder spectra to higher energies.
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Cosmic Ray Spectrum and Composition from PeV to EeV from the IceCube Neutrino Observatory
Using 2010 to 2013 IceTop and IceCube data, the collaboration reports a cosmic ray spectrum that hardens near 20 PeV and softens above 100 PeV, with heavier elements keeping harder spectra to higher energies.