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Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector

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arxiv 1002.4703 v2 pith:I2NC7QND submitted 2010-02-25 astro-ph.CO hep-exphysics.ins-det

Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector

C.E. Aalseth , P.S. Barbeau , N.S. Bowden , B. Cabrera-Palmer , J. Colaresi , J.I. Collar , S. Dazeley , P. de Lurgio
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G. Drake J.E. Fast N. Fields C.H. Greenberg T.W. Hossbach M.E. Keillor J.D. Kephart M.G. Marino H.S. Miley M.L. Miller J.L. Orrell D.C. Radford D. Reyna R.G.H. Robertson R.L. Talaga O. Tench T.D. Van Wechel J.F. Wilkerson K.M. Yocum (CoGeNT collaboration)
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classification astro-ph.CO hep-exphysics.ins-det
keywords damadarkdetectoreffecteventsgermaniumlibramatter
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We report on several features present in the energy spectrum from an ultra low-noise germanium detector operated at 2,100 m.w.e. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss several possible causes for an irreducible excess of bulk-like events below 3 keVee, including a dark matter candidate common to the DAMA/LIBRA annual modulation effect, the hint of a signal in CDMS, and phenomenological predictions. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.

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