NEWSdm [Nuclear Emulsions for WIMP (weakly interacting massive particles) Search-directional measurement] is a new international experiment in which a photoemulsion target is used for a direct detection of dark-matter particles. In this experiment, the detection method is based on fixing the directions of trajectories of recoil nuclei originating from the elastic interaction of target nuclei with dark-matter particles from the galactic halo. This distinguishes NEWSdm from standard low-background experiments aimed at searches for dark-matter particles and based on an analysis of annual modulations of the number of detected events. The detector, which is simultaneously a target, is a block of nuclear emulsions that have a uniquely high spatial resolution owing to the reduction of the size of AgBr grains to about nm. A resolution on this order of magnitude permits directional searches for dark-matter particles in cosmic space even at energies of recoil nuclei not higher than 30 keV.
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