Search for an Annual Modulation in a p-Type Point Contact Germanium Dark Matter Detector

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Review Letters

OSTI ID:1037065

Barbeau, P S ^[1]; Collar, J I ^[1]; Fields, N ^[1]; Hossbach, T W ^[2]; Aalseth, C E ^[2]; Fast, James E ^[2]; Keillor, M ^[2]; Kephart, J D ^[2]; Miley, H S ^[2]; Orrell, John L ^[2]; Colaresi, James F ^[3]; Yocum, K Michael ^[3]; Leon, J Diaz ^[4]; Knecht, A ^[4]; Marino, M G ^[4]; Miller, M L ^[4]; Radford, David C ^[5]; Wilkerson, John F ^[6]

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1. University of Chicago
2. Pacific Northwest National Laboratory (PNNL)
3. Canberra Industries, Inc., Meriden, CT
4. University of Washington, Ctr Expt Nucle Phys & Astrophys
5. ORNL
6. University of North Carolina, Chapel Hill

Fifteen months of cumulative CoGeNT data are examined for indications of an annual modulation, a predicted signature of weakly interacting massive particle (WIMP) interactions. Presently available data support the presence of a modulated component of unknown origin, with parameters prima facie compatible with a galactic halo composed of light-mass WIMPs. Unoptimized estimators yield a statistical significance for a modulation of {approx}2.8{sigma}, limited by the short exposure.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1037065
• Journal Information: Physical Review Letters, Vol. 107, Issue 14; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
GERMANIUM
MODULATION
NONLUMINOUS MATTER
ORIGIN