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All-particle cosmic ray energy spectrum measured with 26 IceTop stations
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2013 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 44, 40-58 p.Article in journal (Refereed) Published
Abstract [en]

We report on a measurement of the cosmic ray energy spectrum with the IceTop air shower array, the surface component of the IceCube Neutrino Observatory at the South Pole. The data used in this analysis were taken between June and October, 2007, with 26 surface stations operational at that time, corresponding to about one third of the final array. The fiducial area used in this analysis was 0.122 km(2). The analysis investigated the energy spectrum from 1 to 100 PeV measured for three different zenith angle ranges between 0 degrees and 46 degrees. Because of the isotropy of cosmic rays in this energy range the spectra from all zenith angle intervals have to agree. The cosmic-ray energy spectrum was determined under different assumptions on the primary mass composition. Good agreement of spectra in the three zenith angle ranges was found for the assumption of pure proton and a simple two-component model. For zenith angles theta < 30 degrees, where the mass dependence is smallest, the knee in the cosmic ray energy spectrum was observed at about 4 PeV, with a spectral index above the knee of about -3.1. Moreover, an indication of a flattening of the spectrum above 22 PeV was observed.

Place, publisher, year, edition, pages
2013. Vol. 44, 40-58 p.
Keyword [en]
Cosmic rays, Energy spectrum, IceCube, IceTop
National Category
Physical Sciences Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-90789DOI: 10.1016/j.astropartphys.2013.01.016ISI: 000318322100006OAI: oai:DiVA.org:su-90789DiVA: diva2:628574
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council
Note

AuthorCount:258;

Available from: 2013-06-14 Created: 2013-06-11 Last updated: 2017-12-06Bibliographically approved

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Bohm, ChristianDanninger, MatthiasFinley, ChadHulth, Per-OlofHultqvist, KlasJohansson, Henrik A. B.Seo, Seon HeeWalck, ChristianWolf, MartinZoll, Marcel
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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Astroparticle physics
Physical SciencesAstronomy, Astrophysics and Cosmology

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