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The DAMIC experiment employs large-area, thick charge-coupled devices (CCDs) to search for the interactions of low-mass dark matter particles in the galactic halo with silicon atoms in the CCD target. From 2017 to 2019, DAMIC collected data with a seven-CCD array (40-gram target) installed in the SNOLAB underground laboratory. We report dark-matter search results, including a conspicuous excess of events above the background model below 200 V_{ee} V e e , whose origin remains unknown. We present details of the published spectral analysis, and update on the deployment of skipper CCDs to perform a more precise measurement by early 2023.more » « less
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We report on recent progress in the search for dark matter particleswith masses from 1 Mev c ^{-2} − 2 to 1 Gev c ^{-2} − 2 .Several dark matter candidates in this mass range are expected togenerate measurable electronic-recoil signals in direct-detectionexperiments. We focus on dark matter particles scattering with electronsin semiconductor detectors since they have fundamentally the highestsensitivity due to their low ionization threshold. Charge-coupled device(CCD) silicon detectors are the leading technology, with significantprogress expected in the coming years. We present the status of the CCDprogram and briefly report on other efforts.more » « less
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Many low-threshold experiments observe sharply rising event rates of yet unknown origins below a few hundred eV, and larger than expected from known backgrounds. Due to the significant impact of this excess on the dark matter or neutrino sensitivity of these experiments, a collective effort has been started to share the knowledge about the individual observations. For this, the EXCESS Workshop was initiated. In its first iteration in June 2021, ten rare event search collaborations contributed to this initiative via talks and discussions. The contributing collaborations were CONNIE, CRESST, DAMIC, EDELWEISS, MINER, NEWS-G, NUCLEUS, RICOCHET, SENSEI and SuperCDMS. They presented data about their observed energy spectra and known backgrounds together with details about the respective measurements. In this paper, we summarize the presented information and give a comprehensive overview of the similarities and differences between the distinct measurements. The provided data is furthermore publicly available on the workshop's data repository together with a plotting tool for visualization.more » « less
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