Track Reconstruction and Performance of DRIFT Directional Dark Matter Detectors using Alpha Particles

First results are presented from an analysis of data from the DRIFT-IIa and DRIFT-IIb directional dark matter detectors at Boulby Mine in which alpha particle tracks were reconstructed and used to characterise detector performance--an important step towards optimising directional technology. The dri...

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Veröffentlicht in:arXiv.org 2007-07
Hauptverfasser: Burgos, S, bes, J, Ghag, C, Gold, M, Kudryavtsev, V A, Lawson, T B, Loomba, D, Majewski, P, McMillan, J E, Muna, D, Murphy, A StJ, Nicklin, G G, Paling, S M, Petkov, A, Plank, S J S, Robinson, M, Sanghi, N, Smith, N J T, Snowden-Ifft, D P, Spooner, N J C, Sumner, T J, Turk, J, Tziaferi, T
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Sprache:eng
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Zusammenfassung:First results are presented from an analysis of data from the DRIFT-IIa and DRIFT-IIb directional dark matter detectors at Boulby Mine in which alpha particle tracks were reconstructed and used to characterise detector performance--an important step towards optimising directional technology. The drift velocity in DRIFT-IIa was [59.3 +/- 0.2 (stat) +/- 7.5 (sys)] m/s based on an analysis of naturally-occurring alpha-emitting background. The drift velocity in DRIFT-IIb was [57 +/- 1 (stat) +/- 3 (sys)] m/s determined by the analysis of alpha particle tracks from a Po-210 source. 3D range reconstruction and energy spectra were used to identify alpha particles from the decay of Rn-222, Po-218, Rn-220 and Po-216. This study found that (22 +/- 2)% of Po-218 progeny (from Rn-222 decay) are produced with no net charge in 40 Torr CS2. For Po-216 progeny (from Rn-220 decay) the uncharged fraction is (100 +0 -35)%.
ISSN:2331-8422
DOI:10.48550/arxiv.0707.1758