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Search for annual modulation in low-energy CDMS-II data

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arxiv 1203.1309 v2 pith:PJOHDTSM submitted 2012-03-06 astro-ph.CO hep-ex

CDMS Collaboration: Z. Ahmed , D.S. Akerib , A.J. Anderson , S. Arrenberg , C.N. Bailey , D. Balakishiyeva , L. Baudis , D.A. Bauer
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P.L. Brink T. Bruch R. Bunker B. Cabrera D.O. Caldwell J. Cooley P. Cushman M. Daal F. DeJongh P.C.F. Di Stefano M.R. Dragowsky S. Fallows E. Figueroa-Feliciano J. Filippini J. Fox M. Fritts S.R. Golwala J. Hall S.A. Hertel T. Hofer D. Holmgren L. Hsu M.E. Huber O. Kamaev M. Kiveni M. Kos S.W. Leman S. Liu R. Mahapatra V. Mandic K.A. McCarthy N. Mirabolfathi D.C. Moore H. Nelson R.W. Ogburn A. Phipps K. Prasad M. Pyle X. Qiu W. Rau A. Reisetter Y. Ricci T. Saab B. Sadoulet J. Sander R.W. Schnee D. Seitz B. Serfass D. Speller K.M. Sundqvist M. Tarka R.B. Thakur A.N. Villano B. Welliver S. Yellin J. Yoo B.A. Young J. Zhang
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classification astro-ph.COhep-ex
keywords modulationannualeventinteractionsrangerecoilsconfidenceconsistent
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We report limits on annual modulation of the low-energy event rate from the Cryogenic Dark Matter Search (CDMS II) experiment at the Soudan Underground Laboratory. Such a modulation could be produced by interactions from Weakly Interacting Massive Particles (WIMPs) with masses ~10 GeV/c^2. We find no evidence for annual modulation in the event rate of veto-anticoincident single-detector interactions consistent with nuclear recoils, and constrain the magnitude of any modulation to <0.06 event [keVnr kg day]^-1 in the 5-11.9 keVnr energy range at the 99% confidence level. These results disfavor an explanation for the reported modulation in the 1.2-3.2 keVee energy range in CoGeNT in terms of nuclear recoils resulting from elastic scattering of WIMPs at >98% confidence. For events consistent with electron recoils, no significant modulation is observed for either single- or multiple-detector interactions in the 3.0-7.4 keVee range.

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