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* Corresponding author 1 Dept. of Physics 2 Dept. of Subatomic and Radiation Physics 3 Dept. of Physics and Astronomy 4 Dept. of Physics 5 Dept. of Physics 6 University of Delaware Newark 7 Dept. of Physics and Astronomy 8 Dept. of Physics 9 OSU - Ohio State University Columbus 10 Dept. of Astronomy 11 Science Faculty CP230 12 Dept. of Physics 13 Dept. of Physics and Astronomy 14 RWTH Aachen University Aachen 15 Stockholm University 16 Universität Bonn 17 Dept. of Physics and Astronomy 18 Dept. of Physics 19 Dept. of Physics 20 École Polytechnique Fédérale 21 MPIK - Max-Planck-Institut für Kernphysik 22 Dept. of Astronomy and Astrophysics 23 VUB - Vrije Universiteit Brussel 24 Dept. of Physics and Astronomy 25 Dept. of Physics 26 Humboldt Universität zu Berlin Berlin 27 Dept. of Astronomy 28 Dept. of Physics 29 University of Mainz 30 Dept. of Physics and Astronomy 31 UMons - Université de Mons 32 Dept. of Physics 33 Dept. of Physics and Astronomy 34 Dept. of Physics 35 GATECH - Georgia Institute of Technology

Abstract : Using the South Pole Acoustic Test Setup SPATS and a retrievable transmitter deployed in holes drilled for the IceCube experiment, we have measured the attenuation of acoustic signals by South Pole ice at depths between 190 m and 500 m. Three data sets, using different acoustic sources, have been analyzed and give consistent results. The method with the smallest systematic uncertainties yields an amplitude attenuation coefficient α=3.20 ± 0.57 km between 10 and 30 kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for λ ≡1-α of ∼300 m with 20% uncertainty. No significant depth or frequency dependence has been found.

Keywords : neutrino astronomy acoustics South Pole acoustic attenuation ice

Autor: R. Abbasi - Y. Abdou - T. Abu-Zayyad - J. Adams - J.A. Aguilar - M. Ahlers - K. Andeen - J. Auffenberg - X. Bai - M. Baker - S.W.



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