Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 851, Issue -, Pages 103-107Publisher
ELSEVIER
DOI: 10.1016/j.nima.2017.01.041
Keywords
Dark matter; WIMP; Low-background techniques; Background veto; Liquid scintillator; Radioactivity
Categories
Funding
- IBS-R016-A1
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [NRF2011-35B-000007]
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We report the performance of an active veto system using a liquid scintillator with NaI(Tl) crystals for use in a dark matter search experiment. When a NaI(Tl) crystal is immersed in the prototype detector, the detector tags 48% of the internal K-40 background in the 0-10 keV energy region. We also determined the tagging efficiency for events at 6-20 keV as 26.5 +/- 1.7% of the total events, which corresponds to 0.76 +/- 0.04 events/keV/kg/day. According to a simulation, approximately 60% of the background events from U, Th, and K radioisotopes in photomultiplier tubes are tagged at energies of 0-10 keV. Full shielding with a 40-cm-thick liquid scintillator can increase the tagging efficiency for both the internal K-40 and external background to approximately 80%.
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