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Recent computational results suggest that directional dark matter detectorshave potential to probe for WIMP dark matter particles below the neutrinofloor. The DRIFT-IId detector used in this work is a leading directional WIMPsearch time projection chamber detector. We report the first measurements ofthe detection of the directional nuclear recoils in a fully fiducialisedlow-pressure time projection chamber. In this new operational mode, thedistance between each event vertex and the readout plane is determined by themeasurement of minority carriers produced by adding a small amount of oxygen tothe nominal CS$_{2}$ + CF$_{4}$ target gas mixture. The CS$_2$ + CF$_4$ + O$_2$mixture has been shown to enable background-free operation at currentsensitivities. Sulfur, fluorine, and carbon recoils were generated usingneutrons emitted from a $^{252}$Cf source positioned at different locationsaround the detector. Measurement of the relative energy loss along the recoiltracks allowed the track vector sense, or the so-called head-tail asymmetryparameter, to be deduced. Results show that the previously reported observationof head-tail sensitivity in pure CS$_{2}$ is well retained after the additionof oxygen to the gas mixture.

First measurement of nuclear recoil head-tail sense in a fiducialised WIMP dark matter detector