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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Aalseth, CE; Barbeau, PS; Bowden, NS; Cabrera-Palmer, B; Colaresi, J; Collar, JI; Dazeley, S; de Lurgio, P; Fast, JE; Fields, N; Greenberg, CH; Hossbach, TW; Keillor, ME; Kephart, JD; Marino, MG; Miley, HS; Miller, ML; Orrell, JL; Radford, DC; Reyna, D; Tench, O; Van Wechel, TD; Wilkerson, JF; Yocum, KM; CoGeNT Collaboration,

Published Date

  • April 2011

Published In

Volume / Issue

  • 106 / 13

Start / End Page

  • 131301 -

PubMed ID

  • 21517370

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.106.131301


  • eng