We present new results with a prototype detector that is being developed by the DMTPC collaboration for the measurement of the direction tag (head-tail) of dark matter wind. We use neutrons from a Cf-252 source to create low-momentum nuclear recoils in elastic scattering with the residual gas nuclei. The recoil track is imaged in low-pressure time-projection chamber with optical readout. We measure the ionization rate along the recoil trajectory, which allows us to determine the direction tag of the incoming neutrons.
@article{arxiv.0801.2687,
title = {Improved measurement of the head-tail effect in nuclear recoils},
author = {D. Dujmic and S. Ahlen and P. Fisher and S. Henderson and A. Kaboth and G. Kohse and R. Lanza and M. Lewandowska and J. Monroe and A. Roccaro and G. Sciolla and N. Skvorodnev and H. Tomita and R. Vanderspek and H. Wellenstein and R. Yamamoto},
journal= {arXiv preprint arXiv:0801.2687},
year = {2009}
}
Comments
Contributed to the International Conference on Topics in Astroparticle and Underground Physics (TAUP) 2007, Sendai, Japan (3 pages, 4 figures)