Burgos, S and Forbes, J and Ghag, C and Gold, M and Kudryavtsev, VA and Lawson, TB and Loomba, D and Majewski, P and Muna, D and Murphy, AS and Nicklin, GG and Paling, SM and Petkov, A and Plank, SJS and Robinson, M and Sanghi, N and Smith, NJT and Snowden-Ifft, DP and Spooner, NJC and Sumner, TJ and Turk, J and Tziaferi, E (2007) First Results from the DRIFT-IIa Dark Matter Detector. Astropart.Phys.28:409-421,2007 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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