E-viri
PDF
Recenzirano
Odprti dostop
-
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
Physical review letters, 2011-Apr-01, Letnik: 106, Številka: 13Journal 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.
