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Radiopurity measurements of liquid scintillator for the COSINE-100 Upgrade

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arxiv 2411.05256 v2 pith:BTP4ASS6 submitted 2024-11-08 physics.ins-det hep-ex

classification physics.ins-dethep-ex
keywords scintillatorcosine-100liquidupgradeactivityanalysesbeenconsisting
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abstract

A new 2,400 L liquid scintillator has been produced for the COSINE-100 Upgrade, which is under construction at Yemilab for the next COSINE dark matter experiment phase. The linear-alkyl-benzene-based scintillator is designed to serve as a veto for NaI(Tl) crystal targets and a separate platform for rare event searches. We measured using a sample consisting of a custom-made 445 mL cylindrical Teflon container equipped with two 3-inch photomultiplier tubes. Analyses show activity levels of $0.091 \pm 0.042$ mBq/kg for $^{238}$U and $0.012 \pm 0.007$ mBq/kg for $^{232}$Th.

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