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2010-04-13 - Article/Dans un journal avec peer-review - Anglais - 15 page(s)

Kohnen Georges , IceCube Collaboration , "Measurement of Acoustic Attenuation in South Pole Ice" in Astroparticle Physics, 34, 382-393

  • Edition : Elsevier (Netherlands)
  • Codes CREF : Physique des particules élémentaires (DI1221), Astrophysique (DI1455)
  • Unités de recherche UMONS : Physique nucléaire et subnucléaire (S824)

Abstract(s) :

(Anglais) 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 alpha = 3.20 \pm 0.57 km^(-1) between 10 and 30 kHz, considerably larger than previous theoretical estimates. Expressed as an attenuation length, the analyses give a consistent result for lambda = 1/alpha of ~1/300 m with 20% uncertainty. No significant depth or frequency dependence has been found.

Identifiants :
  • arXiv : 1004.1694