We show that the energy threshold for nuclear recoils in the XENON10 dark matter search data can be lowered to ∼ 1 keV, by using only the ionization signal. In other words, we make no requirement that a valid event contain a primary scintillation signal. We therefore relinquish incident particle type discrimination, which is based on the ratio of ionization to scintillation in liquid xenon. This method compromises the detector's ability to precisely determine the z coordinate of a particle interaction. However, we show for the first time that it is possible to discriminate bulk events from surface events based solely on the ionization signal.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2010|
|Event||8th International Workshop on Identification of Dark Matter, IDM 2010 - Montpellier, France|
Duration: Jul 26 2010 → Jul 30 2010
ASJC Scopus subject areas