Results from a search for light-mass dark matter with a p-type point contact germanium detector.

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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Cite this paper

@article{Aalseth2011ResultsFA, title={Results from a search for light-mass dark matter with a p-type point contact germanium detector.}, author={Craig E. Aalseth and P S Barbeau and N . S . Bowden and B. Cabrera-Palmer and James F. Colaresi and J I Collar and S . A . Dazeley and Patrick M De Lurgio and James E. Fast and N E Fields and Cathryn H. Greenberg and T W Hossbach and Martin E. Keillor and Jeremy Kephart and Mark G Marino and Harry S. Miley and Marc Miller and J L Orrell and D. Christopher Radford and Dalila Reyna and O K Tench and T D Van Wechel and John F. Wilkerson and K. Michael Yocum}, journal={Physical review letters}, year={2011}, volume={106 13}, pages={131301} }