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Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment

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Title: Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment

Author(s): J.S. Park; P. Adhikari; G. Adhikari; S.Y. Oh; N.Y. Kim; Y.D. Kim; C. Ha; K.S. Park; H.S. Lee; E.J. Jeon

Subject: Background veto, ; Dark matter, ; Liquid scintillator, ; Low-background techniques, ; Radioactivity, ; WIMP

Journal: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.851, pp.103 - 107

Abstract: 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 40K 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 40K and external background to approximately 80%. © 2017 Elsevier B.V