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A detector that measures recoil directions could tell them apart, if it can track recoils only a few keV in energy.","posed_since":"","precise":"In the neutrino fog, defined by O'Hare as the region where the discovery-limit index $n = -(d \\ln \\sigma / d \\ln \\mathrm{exposure})^{-1}$ exceeds 2, sensitivity grows slower than $1/\\sqrt{\\mathrm{exposure}}$. The question is the angular resolution, head-tail recognition efficiency and threshold (e.g., in a He:$\\mathrm{SF_6}$ or $\\mathrm{CF_4}$ gas time projection chamber) needed to restore n near 1 at WIMP masses 5-10 GeV and cross sections about one order of magnitude below the 8B fog boundary for the chosen target, and the exposure this requires.","problem_ref":"237fc79f0868b0378b02cd62d1cb6fb6b46dcfc19d1e449a6666694cc53feb53","references":"","settled_by":"Demonstrated head-tail sensitivity and angular resolution for few-keV nuclear recoils in a prototype, combined with a sensitivity calculation using the measured performance.","status_note":"","title":"Can recoil direction separate dark matter from solar 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