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29 March 2024
 
  » arxiv » 1701.4514

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Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment
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 ;
Date 17 Jan 2017
AbstractWe 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%.
Source arXiv, 1701.4514
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