Burgos, S; Forbes, J; Ghag, C; Gold, M; Kudryavtsev, VA; Lawson, TB; ... Tziaferi, E; + view all Burgos, S; Forbes, J; Ghag, C; Gold, M; Kudryavtsev, VA; Lawson, TB; Loomba, D; Majewski, P; Muna, D; Murphy, AS; Nicklin, GG; Paling, SM; Petkov, A; Plank, SJS; Robinson, M; Sanghi, N; Smith, NJT; Snowden-Ifft, DP; Spooner, NJC; Sumner, TJ; Turk, J; Tziaferi, E; - view fewer (2007) First Results from the DRIFT-IIa Dark Matter Detector. Astropart.Phys. , 28 409 - 421. 10.1016/j.astropartphys.2007.08.007.
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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 8x10-6 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 in the Boulby Underground Laboratory is derived from analysis of unshielded and shielded data.
|Title:||First Results from the DRIFT-IIa Dark Matter Detector|
|Additional information:||43 pages, 14 figures, submitted to Astroparticle Physics|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy|
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