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Measurement of the direction of the elastic nuclear recoil track andionization charge distribution along it, gives unique possibility forunambiguous detection of the dark matter WIMP particle. Within currentradiation detection technologies only Time Projection Chambers filled with lowpressure gas are capable of such measurement. Due to the character of theelectronic and nuclear stopping powers of low energy nuclear recoils in thegas, an asymmetric ionization charge distribution along their tracks may beexpected. Preliminary study of this effect, called Head-Tail, has been carriedout here using the SRIM simulation program for Carbon and Sulfur in 40 Torrcarbon disulfide, as relevant to the DRIFT detector. Investigations werefocused on ion tracks projected onto the axis of the initial direction ofmotion in the energy range between 10 and 400 keV. Results indicate the likelyexistence of an asymmetry influenced by two competing effects: the nature ofthe stopping power and range straggling. The former tends to result in the Tailbeing greater than the Head and the latter the reverse. It has been found thatfor projected tracks the mean position of the ionization charge flows from'head' to 'tail' with the magnitude depending on the ion type and its energy.

The DRIFT Directional Dark Matter Detector and First Studies of the Head-Tail Effect