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Lowering the low-energy threshold of xenon detectors

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arxiv 1011.6439 v1 pith:DBQU44OJ submitted 2010-11-30 astro-ph.IM astro-ph.COhep-ph

Lowering the low-energy threshold of xenon detectors

classification astro-ph.IM astro-ph.COhep-ph
keywords ionizationsignaleventsparticlescintillationthresholdxenonability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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