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  • Open Access

Paleodetector bounds on cosmic-ray-boosted dark matter

Jin-Wei Wang* and Fei-Fei Li

  • *Contact author: jinwei.wang@uestc.edu.cn

Phys. Rev. D 114, 075006 – Published 7 October, 2026

DOI: https://doi.org/10.1103/1hbk-n9sq

Abstract

We present the first dedicated analysis of cosmic-ray boosted dark matter (CRDM) in paleodetectors. Owing to their large kinetic energies, CRDM particles generate nuclear-recoil tracks that extend to substantially larger lengths than those produced by dominant backgrounds from neutrinos and intrinsic radioactivity. Combined with the ultralarge effective geological exposure of O(105)  t yr, paleodetectors provide high sensitivity to sub-GeV dark matter (DM). Considering both constant and vector-mediator interactions, we find that paleodetectors improve the sensitivity to the DM-proton scattering cross section by one to two orders of magnitude compared with the latest XENONnT limits.

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