SABRE South, a 35-50 kg NaI(Tl) detector with a liquid scintillator veto at the Stawell Underground Physics Laboratory, is projected to reach 5 sigma discovery or 3 sigma exclusion of the DAMA/LIBRA annual modulation after two years, assuming a total background of 0.72 cpd/kg/keV.
Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment
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abstract
COSINE-100 is a direct dark matter search experiment, with the primary goal of testing the annual modulation signal observed by DAMA/LIBRA, using the same target material, NaI(Tl). In previous analyses, we achieved the same 1 keV energy threshold used in the DAMA/LIBRA's analysis that reported an annual modulation signal with 11.6$\sigma$ significance. In this article, we report an improved analysis that lowered the threshold to 0.7 keV, thanks to the application of Multi-Layer Perception network and a new likelihood parameter with waveforms in the frequency domain. The lower threshold would enable a better comparison of COSINE-100 with new DAMA results with a 0.75 keV threshold and account for differences in quenching factors. Furthermore the lower threshold can enhance COSINE-100's sensitivity to sub-GeV dark matter searches.
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The SABRE South Technical Design Report Executive Summary
SABRE South, a 35-50 kg NaI(Tl) detector with a liquid scintillator veto at the Stawell Underground Physics Laboratory, is projected to reach 5 sigma discovery or 3 sigma exclusion of the DAMA/LIBRA annual modulation after two years, assuming a total background of 0.72 cpd/kg/keV.