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We show that dark matter with a per-nucleon scattering cross section $\gtrsim10^{-28}~{\rm cm^2}$ could be discovered by liquid scintillator neutrinodetectors like BOREXINO, SNO+, and JUNO. Due to the large dark matter fluxesadmitted, these detectors could find dark matter with masses up to $10^{21}$GeV, surpassing the mass sensitivity of current direct detection experiments(such as XENON1T and PICO) by over two orders of magnitude. We derive thespin-independent and spin-dependent cross section sensitivity of thesedetectors using existing selection triggers, and propose an improved triggerprogram that enhances this sensitivity by two orders of magnitude. We interpretthese sensitivities in terms of three dark matter scenarios: (1) effectivecontact operators for scattering, (2) QCD-charged dark matter, and (3) arecently proposed model of Planck-mass baryon-charged dark matter. We calculatethe flux attenuation of dark matter at these detectors due to the earthoverburden, taking into account the earth's density profile and elementalcomposition, and nuclear spins.

Foraging for dark matter in large volume liquid scintillator neutrino detectors with multiscatter events