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Several directional techniques have been proposed for a directional detectionof Dark matter, among others anisotropic crystal detectors, nuclear emulsionplates, and low-pressure gaseous TPCs. The key point is to get access to theinitial direction of the nucleus recoiling due to the elastic scattering by aWIMP. In this article, we aim at estimating, for each method, how theinformation of the recoil track initial direction is preserved in differentdetector materials. We use the SRIM simulation code to emulate the motion ofthe first recoiling nucleus in each material. We propose the use of a newobservable, D, to quantify the preservation of the initial direction of therecoiling nucleus in the detector. We show that in an emulsion mix and ananisotropic crystal, the initial direction is lost very early, while in atypical TPC gas mix, the direction is well preserved.

Dark Matter directional detection: comparison of the track direction determination