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

  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 Nathaniel S. Bowden and Belkis Cabrera-Palmer and James F. Colaresi and J. I. Collar and Steven A. Dazeley and Patrick M. De Lurgio and James E. Fast and N. E. Fields and C H Greenberg and T. W. Hossbach and Martin E. Keillor and Jeremy Dale Kephart and Michael G. Marino and Harry S. Miley and M. L. Miller and John L. Orrell and David C Radford and David Reyna and O. Tench and T.D. Van Wechel and John F. Wilkerson and K. M. Yocum},
  journal={Physical review letters},
  volume={106 13},
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… Expand
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