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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