title: 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.
authors.affiliation: Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
authors.forename: C E
authors.initials: CE
authors.lastname: Aalseth
authors.forename: P S
authors.initials: PS
authors.lastname: Barbeau
authors.forename: N S
authors.initials: NS
authors.lastname: Bowden
authors.forename: B
authors.initials: B
authors.lastname: Cabrera-Palmer
authors.forename: J
authors.initials: J
authors.lastname: Colaresi
authors.forename: J I
authors.initials: JI
authors.lastname: Collar
authors.forename: S
authors.initials: S
authors.lastname: Dazeley
authors.forename: P
authors.initials: P
authors.lastname: de Lurgio
authors.forename: J E
authors.initials: JE
authors.lastname: Fast
authors.forename: N
authors.initials: N
authors.lastname: Fields
authors.forename: C H
authors.initials: CH
authors.lastname: Greenberg
authors.forename: T W
authors.initials: TW
authors.lastname: Hossbach
authors.forename: M E
authors.initials: ME
authors.lastname: Keillor
authors.forename: J D
authors.initials: JD
authors.lastname: Kephart
authors.forename: M G
authors.initials: MG
authors.lastname: Marino
authors.forename: H S
authors.initials: HS
authors.lastname: Miley
authors.forename: M L
authors.initials: ML
authors.lastname: Miller
authors.forename: J L
authors.initials: JL
authors.lastname: Orrell
authors.forename: D C
authors.initials: DC
authors.lastname: Radford
authors.forename: D
authors.initials: D
authors.lastname: Reyna
authors.forename: O
authors.initials: O
authors.lastname: Tench
authors.forename: T D
authors.initials: TD
authors.lastname: Van Wechel
authors.forename: J F
authors.initials: JF
authors.lastname: Wilkerson
authors.forename: K M
authors.initials: KM
authors.lastname: Yocum