Lowering the low-energy threshold of xenon detectors

Details Lowering the low-energy threshold of xenon detectors Lowering the low-energy threshold of xenon detectors

2010-11-30

arxiv.org/abs/1011.6439v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Conference proceedings from the Identification of Dark Matter 2010, Montpellier, France. To be published by SISSA as PoS(IDM20

Scientific paper

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.

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