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  • First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector
    Bai, X; Barwick, S W; Bazo Alba, J L; Beatty, J J; Becker, J K; Benabderrahmane, M L; BenZvi, S; Berdermann, J; Berley, D; Bernardini, E; Bertrand, D; S B; Buitink, S; Chirkin, D; Cohen, S; Colnard, C; D'Agostino, M V; Daughhetee, J; "ors; Denger, T; Desiati, P; D'iaz-Vélez, J C; Ehrlich, R; Filimonov, K; Fischer-Wasels, T; Franckowiak, A; Gaisser, T K; Gerhardt, L; Goodman, J A; Grullon, S; Gurtner, M; Hickford, S; Hill, G C; Hoffman, K D; Hoshina, K; Hubert, D; J -P Hül\ss; Hultqvist, K; Hussain, S; Japaridze, G S; K -H Kampert; Kelley, J L; Kislat, F; Klein, S R; Kowalski, M; Krasberg, M; Kuehn, K; Lafebre, S; Laihem, K; Landsman, H; Larson, M J; Lauer, R; Lünemann, J; Madsen, J; Maruyama, R; Mase, K; Meagher, K; Middell, E; Miller, J; Montaruli, T; Nahnhauer, R; Nam, J W; Olivo, M; O'Murchadha, A; Paul, L; C Pérez de los Heros; Petrovic, J; Pieloth, D; Porrata, R; Posselt, J; Price, P B; Rawlins, K; Resconi, E; Rhode, W; Ribordy, M; Rizzo, A; Rodrigues, J P; Rott, C; Ryckbosch, D; Schultes, A; Seckel, D; Stamatikos, M; Stezelberger, T; Stoyanov, S; Straszheim, T; Sullivan, G W; Tarasova, O; Tosi, D; D Tur\v\can; Vandenbroucke, J; A Van Overloop; Vehring, M; Walck, C; Waldenmaier, T; Wallraff, M; Walter, M; Whitehorn, N; Wiebe, K; Wissing, H; Woschnagg, K

    arXiv.org, 01/2011
    Paper, 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 \(8.3\pm 3.6\). At 90% confidence we set an upper limit of \(E^2\Phi_{90%CL}<3.6\times10^{-7} GeV \cdot cm^{-2} \cdot s^{-1}\cdot sr^{-1} \) on the diffuse flux of neutrinos of all flavors in the energy range between 24 TeV and 6.6 PeV assuming that \(\Phi \propto E^{-2}\) and that 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.

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