Ahmed, Z. and Akerib, D. S. and Arrenberg, S. and Bailey, C. N. and Balakishiyeva, D. and Baudis, L. and Bauer, D. A. and Beaty, J. and Brink, P. L. and Bruch, T. and Bunker, R. and Cabrera, B. and Caldwell, D. O. and Cooley, J. and Cushman, P. and DeJongh, F. and Dragowsky, M. R. and Duong, L. and Figueroa-Feliciano, E. and Filippini, J. and Fritts, M. and Golwala, S. R. and Grant, D. R. and Hall, J. and Hennings-Yeomans, R. and Hertel, S. and Holmgren, D. and Hsu, L. and Huber, M. E. and Kamaev, O. and Kiveni, M. and Kos, M. and Leman, S. W. and Mahapatra, R. and Mandic, V. and Moore, D. and McCarthy, K. A. and Mirabolfathi, N. and Nelson, H. and Ogburn, R. W. and Pyle, M. and Qiu, X. and Ramberg, E. and Rau, W. and Reisetter, A. and Saab, T. and Sadoulet, B. and Sander, J. and Schnee, R. W. and Seitz, D. N. and Serfass, B. and Sundqvist, K. M. and Wang, G. and Wikus, P. and Yellin, S. and Yoo, J. and Young, B. A. (2010) Analysis of the low-energy electron-recoil spectrum of the CDMS experiment. Physical Review D, 81 (4). Art. No. 042002. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:20100416-110656096
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We report on the analysis of the low-energy electron-recoil spectrum from the CDMS II experiment using data with an exposure of 443.2 kg-days. The analysis provides details on the observed counting rate and possible background sources in the energy range of 2–8.5 keV. We find no significant excess of a peaked contribution to the total counting rate above the background model, and compare this observation to the recent DAMA results. In the framework of a conversion of a dark matter particle into electromagnetic energy, our 90% confidence level upper limit of 0.246 events/kg/day at 3.15 keV is lower than the total rate above background observed by DAMA. In absence of any specific particle physics model to provide the scaling in cross section between NaI and Ge, we assume a Z2 scaling. With this assumption the observed rate in DAMA remains higher than the upper limit in CDMS. Under the conservative assumption that the modulation amplitude is 6% of the total rate we obtain upper limits on the modulation amplitude a factor of ~2 lower than observed by DAMA, constraining some possible interpretations of this modulation.
|Additional Information:||© 2010 The American Physical Society. Received 5 November 2009; published 24 February 2010. This work is supported in part by the National Science Foundation (Grant Nos. AST-9978911, PHY-0542066, PHY-0503729, PHY-0503629, PHY-0503641, PHY-0504224, PHY-0705052, PHY-0801536, PHY-0801708, PHY-0801712 and PHY-0802575), by the Department of Energy (Contracts DE-AC03-76SF00098, DE-FG02- 91ER40688, DE-FG02-92ER40701, DE-FG03- 90ER40569, and DE-FG03-91ER40618), by the Swiss National Foundation (SNF Grant No. 20-118119), and by NSERC Canada (Grant SAPIN 341314-07).|
|Classification Code:||PACS: 29.40.-n, 29.40.Wk, 85.25.Oj, 95.30.Cq|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||27 Apr 2010 16:10|
|Last Modified:||06 Mar 2013 04:40|
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