First Results from the DRIFT-IIa Dark Matter Detector

Details First Results from the DRIFT-IIa Dark Matter Detector First Results from the DRIFT-IIa Dark Matter Detector

2007-07-10

arxiv.org/abs/0707.1488v1

Astropart.Phys.28:409-421,2007

Physics

High Energy Physics

High Energy Physics - Experiment

43 pages, 14 figures, submitted to Astroparticle Physics

Scientific paper

10.1016/j.astropartphys.2007.08.

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.

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