Burgos, S;
Forbes, J;
Ghag, C;
Gold, M;
Kudryavtsev, VA;
Lawson, TB;
Loomba, D;
... Tziaferi, E; + view all
(2007)
Studies of neutron detection and backgrounds with the DRIFT-IIa dark matter detector.
Astroparticle Physics
, 28
(4-5)
pp. 409-421.
10.1016/j.astropartphys.2007.08.007.
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Abstract
Data from the DRIFT-IIa directional dark matter experiment are presented, collected during a near continuous 6 month running period. A detailed calibration analysis comparing data from gamma-ray, X-ray and neutron sources to a GEANT4 Monte Carlo simulations reveals an efficiency for detection of neutron induced recoils of 94 ± 2(stat.) ± 5(sys.)%. Software-based cuts, designed to remove non-nuclear recoil events, are shown to reject 60Co gamma-rays with a rejection factor of better than 8 × 10-6 for all energies above threshold. An unexpected event population has been discovered and is shown here to be due to the alpha-decay of 222Rn daughter nuclei that have attached to the central cathode. A limit on the flux of neutrons (<4 neutrons recoils day-1) in the Boulby Underground Laboratory is derived from analysis of unshielded and shielded data. © 2007 Elsevier B.V. All rights reserved.
| Type: | Article |
|---|---|
| Title: | Studies of neutron detection and backgrounds with the DRIFT-IIa dark matter detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.astropartphys.2007.08.007 |
| Publisher version: | https://doi.org/10.1016/j.astropartphys.2007.08.00... |
| 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; DRIFT; Neutralino; Radon detection; Negative ion TPC; Directionality; WIMP |
| 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/1352146 |
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