Spin-Dependent Limits from the DRIFT-IId Directional Dark Matter Detector

Understand

Data are presented from the DRIFT-IId detector housed in the Boulby mine in northeast England.

• A 0.8 m^3 fiducial volume, containing partial pressures of 30 Torr CS2 and 10 Torr CF4, was exposed for a duration of 47.4 live-time days with sufficient passive shielding to provide a neutron free environment within the detector.
• The nuclear recoil events seen are consistent with a remaining low level background from the decay of progeny of radon daughters attached to the central cathode of the detector.
• However, energy depositions from such events must drift across the entire width of the detector, and thus display large diffusion upon reaching the readout planes of the device.