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Old Rocks, New Limits: Excavated Ancient Mica Searches For Dark Matter
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Minerals excavated from the Earth's crust contain gigayear-long astroparticle records, which can be read out using acid etching and microscopy, providing unmatched sensitivity to high mass dark matter. A roughly millimetre size slab of 500 million year old muscovite mica, calibrated and analyzed by Snowden-Ifft et al.~in 1990, revealed no signs of dark matter recoils and placed competitive limits on the nuclear interactions for sub-TeV mass dark matter. A different analysis of larger mica slabs in 1986 by Price and Salamon searched for strongly interacting monopoles. After implementing a detailed treatment of Earth's overburden, we utilize these ancient etched mica data to obtain new bounds on high mass dark matter interactions with nuclei.
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Mineral Detection of Neutrinos and Dark Matter 2025 Proceedings
A workshop proceedings presenting 20 status reports on mineral detectors as passive, long-exposure nuclear recoil detectors for dark matter, neutrinos, and cosmic rays.
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