Event Details

The sensitivity of the direct detection experiments for DM is approaching the neutrino floor, the irreducible background due to solar and atmospheric neutrinos, below which the DM signal can not be identified utilizing just the recoil energy spectrum. Due to the motion of the earth in the galactic rest frame, the DM signal is expected to exhibit a preferred recoil direction that could be used to separate the signal from the background, but building detectors that can directly observe the recoil direction seems unfeasible in large scale. I will describe how the directional sensitivity of the scattering rate in anisotropic materials, such as crystals, induces a daily modulation to the DM scattering event rate. I will discuss how the daily modulation can be used to identify the DM signal and to suppress the solar neutrino background, and how information about the interactions of DM and the velocity distribution of DM in the Milky Way halo could be inferred from the structure of the daily modulation signal.