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The COHERENT collaboration searched for scalar dark matter particles producedat the Spallation Neutron Source with masses between 1 and 220~MeV/c$^2$ usinga CsI[Na] scintillation detector sensitive to nuclear recoils above9~keV$_\text{nr}$. No evidence for dark matter is found and we thus placelimits on allowed parameter space. With this low-threshold detector, we aresensitive to coherent elastic scattering between dark matter and nuclei. Thecross section for this process is orders of magnitude higher than for otherprocesses historically used for accelerator-based direct-detection searches sothat our small, 14.6~kg detector significantly improves on past constraints. Atpeak sensitivity, we reject the flux consistent with the cosmologicallyobserved dark-matter concentration for all coupling constants $\alpha_D<0.64$,assuming a scalar dark-matter particle. We also calculate the sensitivity offuture COHERENT detectors to dark-matter signals which will ambitiously testmultiple dark-matter spin scenarios.

First Probe of Sub-GeV Dark Matter Beyond the Cosmological Expectation with the COHERENT CsI Detector at the SNS