Burgos, S;
Daw, E;
Forbes, J;
Ghag, C;
Gold, M;
Hagemann, C;
Kudryavtsev, VA;
... Tziaferi, E; + view all
(2009)
Low energy electron and nuclear recoil thresholds in the DRIFT-II negative ion TPC for dark matter searches.
Journal of Instrumentation
, 4
(4)
, Article P04014. 10.1088/1748-0221/4/04/P04014.
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Abstract
Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail an assessment of the potential sensitivity below 10 keV in the 1 m3 DRIFT-II directionally sensitive, low pressure, negative ion time projection chamber (NITPC), based on event-by-event track reconstruction and calorimetry in the multiwire proportional chamber (MWPC) readout. By application of a digital smoothing polynomial it is shown that the detector is sensitive to sulfur and carbon recoils down to 2.9 and 1.9 keV respectively, and 1.2 keV for electron induced events. The energy sensitivity is demonstrated through the 5.9 keV gamma spectrum of 55Fe, where the energy resolution is sufficient to identify the escape peak. The effect of a lower energy sensitivity on the WIMP exclusion limit is demonstrated. In addition to recoil direction reconstruction for WIMP searches this sensitivity suggests new prospects for applications also in KK axion searches. © 2009 IOP Publishing Ltd and SISSA.
Type: | Article |
---|---|
Title: | Low energy electron and nuclear recoil thresholds in the DRIFT-II negative ion TPC for dark matter searches |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1088/1748-0221/4/04/P04014 |
Publisher version: | https://doi.org/10.1088/1748-0221/4/04/P04014 |
Language: | English |
Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Dark matter; NITPC; MWPC. |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
URI: | https://discovery.ucl.ac.uk/id/eprint/1352134 |
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