Results from a search for light-mass dark matter with a p-type point contact germanium detector |
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| Authors: | Aalseth C E,Barbeau P S,Bowden N S,Cabrera-Palmer B,Colaresi J,Collar J I,Dazeley S,de Lurgio P,Fast J E,Fields N,Greenberg C H,Hossbach T W,Keillor M E,Kephart J D,Marino M G,Miley H S,Miller M L,Orrell J L,Radford D C,Reyna D,Tench O,Van Wechel T D,Wilkerson J F,Yocum K M CoGeNT Collaboration |
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| Affiliation: | Pacific Northwest National Laboratory, Richland, Washington 99352, USA. |
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| Abstract: | We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss an irreducible excess of bulklike events below 3 keV in ionization energy. These could be caused by unknown backgrounds, but also dark matter interactions consistent with DAMA/LIBRA. It is not yet possible to determine their origin. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect. |
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