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First Search for Atmospheric and Extraterrestrial Neutrino-Induced Cascades with the IceCube Detector
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, Department of Physics. 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, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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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2011 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 84, no 7, 072001- p.Article in journal (Refereed) Published
Abstract [en]

We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16 TeV remained after event selections in the diffuse analysis, with an expected total background contribution of 8.3 +/- 3.6. At 90% confidence we set an upper limit of E(2)Phi(90%CL) < 3.6 x 10(-7) GeV.cm(-2).s(-1).sr(-1) on the diffuse flux of neutrinos of all flavors in the energy range between 24 TeV and 6.6 PeV assuming that Phi proportional to E(-2) and the flavor composition of the nu(e):nu(mu):nu(tau) flux is 1:1:1 at the Earth. The atmospheric neutrino analysis was optimized for lower energies. A total of 12 events were observed with energies above 5 TeV. The observed number of events is consistent with the expected background, within the uncertainties.

Place, publisher, year, edition, pages
2011. Vol. 84, no 7, 072001- p.
National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-63118DOI: 10.1103/PhysRevD.84.072001ISI: 000295541100001OAI: oai:DiVA.org:su-63118DiVA: diva2:446780
Projects
IceCube
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
Publikationen har totalt 264 författare, R. Abbasi et al.Available from: 2011-10-09 Created: 2011-10-09 Last updated: 2017-12-08Bibliographically approved

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Bohm, ChristianDanninger, MatthiasFinley, ChadHulth, Per OlofHultqvist, KlasJohansson, HenrikSeo, Seon-HeeWalck, Christian
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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