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  • First search for atmospheri...
    Abbasi, R.; Abdou, Y.; Abu-Zayyad, T.; Aguilar, J. A.; Ahlers, M.; Bechet, S.; Berghaus, P.; Berley, D.; Bernardini, E.; Besson, D. Z.; Böser, S.; Botner, O.; Cohen, S.; Colnard, C.; D’Agostino, M. V.; Davis, J. C.; De Clercq, C.; Demirörs, L.; de Vries-Uiterweerd, G.; DeYoung, T.; Díaz-Vélez, J. C.; Dumm, J. P.; Fedynitch, A.; Finley, C.; Fox, B. D.; Franke, R.; Gallagher, J.; Geisler, M.; Glüsenkamp, T.; Goldschmidt, A.; Griesel, T.; Heinen, D.; Hoshina, K.; Hubert, D.; Hultqvist, K.; Ishihara, A.; Johansson, H.; Joseph, J. M.; Kampert, K.-H.; Kappes, A.; Karle, A.; Kemming, N.; Kislat, F.; Kopper, S.; Koskinen, D. J.; Kowalski, M.; Krasberg, M.; Krings, T.; Kuehn, K.; Kuwabara, T.; Lauer, R.; Madsen, J.; Mase, K.; Merck, M.; Meures, T.; Milke, N.; Miller, J.; Naumann, U.; Nießen, P.; Nygren, D. R.; Odrowski, S.; Olivo, M.; Ono, M.; Panknin, S.; Petrovic, J.; Piegsa, A.; Pieloth, D.; Resconi, E.; Rhode, W.; Ribordy, M.; Roth, P.; Rott, C.; Ruzybayev, B.; Sander, H.-G.; Schatto, K.; Schukraft, A.; Schulz, O.; Semburg, B.; Sestayo, Y.; Slipak, A.; Stephens, G.; Stezelberger, T.; Stokstad, R. G.; Straszheim, T.; Taavola, H.; Taboada, I.; Tilav, S.; Toale, P. A.; Tosi, D.; Turčan, D.; van Santen, J.; Voge, M.; Voigt, B.; Wallraff, M.; Westerhoff, S.; Williams, D. R.; Wischnewski, R.; Wissing, H.; Yoshida, S.; Zarzhitsky, P.

    Physical review. D, Particles, fields, gravitation, and cosmology, 2011, Letnik: 84, Številka: 7
    Journal Article

    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.