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Abstract The COSINE-100 experiment is designed to test the DAMA experiment which claimed an observation of a dark matter signal from an annual modulation in their residual event rate. To measure the 1 %-level signal amplitude, it is crucial to control and monitor nearly all environmental quantities that might systematically mimic the signal. The environmental monitoring also helps ensure a stable operation of the experiment. Here, we describe the design and performance of the centralized environmental monitoring system for the COSINE-100 experiment.Free, publicly-accessible full text available January 1, 2023
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Free, publicly-accessible full text available February 1, 2023
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Free, publicly-accessible full text available August 1, 2022
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Free, publicly-accessible full text available July 1, 2022
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Abstract We present a background model for dark matter searches using an array of NaI(Tl) crystals in the COSINE-100 experiment that is located in the Yangyang underground laboratory. The model includes background contributions from both internal and external sources, including cosmogenic radionuclides and surface $$^{210}$$ 210 Pb contamination. To build the model in the low energy region, with a threshold of 1 keV, we used a depth profile of $$^{210}$$ 210 Pb contamination in the surface of the NaI(Tl) crystals determined in a comparison between measured and simulated spectra. We also considered the effect of the energy scale errors propagated frommore »Free, publicly-accessible full text available September 1, 2022
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Abstract We report the identification of metastable isomeric states of
Ac at 6.28 keV, 6.67 keV and 20.19 keV, with lifetimes of an order of 100 ns. These states are produced by the$$^{228}$$ -decay of$$\beta $$ Ra, a component of the$$^{228}$$ Th decay chain, with$$^{232}$$ Q-values of 39.52 keV, 39.13 keV and 25.61 keV, respectively. Due to the low Q-value of$$\beta $$ Ra as well as the relative abundance of$$^{228}$$ Th and their progeny in low background experiments, these observations potentially impact the low-energy background modeling of dark matter search experiments.$$^{232}$$