Gorham, PW; Allison, P; Barwick, SW; Beatty, JJ; Besson, DZ; Binns, WR; Chen, C; ... ANITA Collaboration; + view all Gorham, PW; Allison, P; Barwick, SW; Beatty, JJ; Besson, DZ; Binns, WR; Chen, C; Chen, P; Clem, JM; Connolly, A; Dowkontt, PF; DuVernois, MA; Field, RC; Goldstein, D; Goodhue, A; Hast, C; Hebert, CL; Hoover, S; Israel, MH; Kowalski, J; Learned, JG; Liewer, KM; Link, JT; Lusczek, E; Matsuno, S; Mercurio, BC; Miki, C; Miocinovic, P; Nam, J; Naudet, CJ; Ng, J; Nichol, RJ; Palladino, K; Reil, K; Romero-Wolf, A; Rosen, M; Ruckman, L; Saltzberg, D; Seckel, D; Varner, GS; Walz, D; Wang, Y; Wu, F; ANITA Collaboration; - view fewer (2009) New Limits on the Ultrahigh Energy Cosmic Neutrino Flux from the ANITA Experiment. PHYS REV LETT , 103 (5) , Article 051103. 10.1103/PhysRevLett.103.051103.

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Abstract

We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of E-nu similar or equal to 3 x 10(18) eV. ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets. We report here on our initial analysis, which was performed as a blind search of the data. No neutrino candidates are seen, with no detected physics background. We set model-independent limits based on this result. Upper limits derived from our analysis rule out the highest cosmogenic neutrino models. In a background horizontal-polarization channel, we also detect six events consistent with radio impulses from ultrahigh energy extensive air showers.

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