First data from DM-Ice17
Ice Collaboration · Cherwinka, J. · Grant, D. · Halzen, F. · Heeger, K. M. · Hsu, L. · Hubbard, A. J. F. · Karle, A. · Kauer, M. · Kudryavtsev, V. A. · Macdonald, C. · Maruyama, R. H. · Paling, S. · Pettus, W. · Pierpoint, Z. P. · Reilly, B. N. · Robinson, M. · Sandstrom, P. · Spooner, N. J. C. · Telfer, S. · Yang, L.
Original · EN
We report the first analysis of background data from DM-Ice17, a direct-detection dark matter experiment consisting of 17 kg of NaI(Tl) target material. It was codeployed with IceCube 2457 m deep in the South Pole glacial ice in December 2010 and is the first such detector operating in the Southern Hemisphere. The background rate in the 6.5 - 8.0 keVee region is measured to be 7.9 +/- 0.4 counts/day/keV/kg. This is consistent with the expected background from the detector assemblies with negligible contributions from the surrounding ice. The successful deployment and operation of DM-Ice17 establishes the South Pole ice as a viable location for future underground, low-background experiments in the Southern Hemisphere. The detector assembly and deployment are described here, as well as the analysis of the DM-Ice17 backgrounds based on data from the first two years of operation after commissioning, July 2011 - June 2013.
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