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

Park, J.S.; Adhikari, P.; Adhikari, G.; Oh, S. Y.; Kim, N.Y.; Kim, Y.D.; Ha, C.; Park, K.S.; Lee, H. S.; Jeon, E. J.

doi:10.1016/j.nima.2017.01.041

Cited by 32 publications

(22 citation statements)

References 29 publications

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“…From our COSINE-100 experience, we have identified the crystal growth as the key component for reducing the overall background, of which radioactive 40 K and 210 Pb contaminants are the most troublesome [29,34,35]. The COSINE-100 detector is immersed in an active liquid scintillator veto system that reduces the impact of 40 K impurities [26,36,37] but 210 Pb has to be eliminated at the crystal production stage. The PICO-LON experiment made a crystal with a 210 Pb contamination as low as 29±7 µBq/kg by using a cation resin-based NaI powder purification system, but had difficulties reproducing additional crystals with similar quality [27,38].…”

Section: Introductionmentioning

confidence: 99%

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

et al. 2020

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The annual modulation signal observed by the DAMA experiment is a long-standing question in the community of dark matter direct detection. This necessitates an independent verification of its existence using the same detection technique. The COSINE-100 experiment has been operating with 106 kg of low-background NaI(Tl) detectors providing interesting checks on the DAMA signal. However, due to higher backgrounds in the NaI(Tl) crystals used in COSINE-100 relative to those used for DAMA, it was difficult to reach final conclusions. Since the start of COSINE-100 data taking in 2016, we also have initiated a program to develop ultra-pure NaI(Tl) crystals for COSINE-200, the next phase of the experiment. The program includes efforts of raw powder purification, ultra-pure NaI(Tl) crystal growth, and detector assembly techniques. After extensive research and development of NaI(Tl) crystal growth, we have successfully grown a few small-size (0.61-0.78 kg) thalliumdoped crystals with high radio-purity. A high light yield has been achieved by improvements of our detector assembly technique. Here we report the ultra-pure NaI(Tl) detector developments at the Institute for Basic Science, Korea. The technique developed here will be applied to the production of NaI(Tl) detectors for the COSINE-200 experiment.

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Section: Introductionmentioning

confidence: 99%

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

et al. 2020

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“…The COSINE-100 detector consists of eight NaI(Tl) crystals with a total mass of 106 kg, a 2200 L linear alkylbenzene (LAB)-based liquid scintillator (LS) veto for internal background suppression with coincidence event tagging [11] as well as cosmic-ray muons, copper and lead shielding, and 37 plastic scintillator (PS) panels that serve as an additional veto for cosmic-ray muons. Figure 1 shows a schematic representation of the COSINE-100 detector and shielding structure.…”

Section: Introductionmentioning

confidence: 99%

The COSINE-100 data acquisition system

Adhikari

Souza

et al. 2018

J. Inst.

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A: COSINE-100 is a dark matter direct detection experiment designed to test the annual modulation signal observed by the DAMA/LIBRA experiment. COSINE-100 consists of 8 NaI(Tl) crystals with a total mass of 106 kg, a 2200 L liquid scintillator veto, and 37 muon detector panels. We present details of the data acquisition system of COSINE-100, including waveform storage using flash analog-to-digital converters for crystal events and integrated charge storage using charge-sensitive analog-to-digital converters for liquid scintillator and plastic scintillator muon veto events. We also discuss several trigger conditions developed in order to distinguish signal events from photomultiplier noise events. The total trigger rate observed for the crystal/liquid scintillator (plastic scintillator) detector is 15 Hz (24 Hz). K: Dark Matter detectors (WIMPs, axions, etc.); Large detector systems for particle and astroparticle physics; Data acquisition concepts; Detector control systems; Front-end electronics for detector readout; Trigger algorithm; Trigger concepts and systems arXiv:1806.09788v1 [physics.ins-det]

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“…COSINE-100 is located at the Yangyang Underground Laboratory (Y2L) in South Korea, with >700 m of rock overburden. It consists of eight NaI(Tl) crystals with a total mass of 106 kg immersed in 2200 l of liquid scintillator (LS) that reduces internal and external backgrounds [28]. Each NaI(Tl) crystal is optically coupled to two photomultiplier tubes (PMTs), each of which detects scintillation photons with the signals recorded as 8 µs waveforms [29].…”

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confidence: 99%

Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

Adhikari¹,

Adhikari²,

Souza³

et al. 2019

Phys. Rev. Lett.

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We present new constraints on the dark matter-induced annual modulation signal using 1.7 years of COSINE-100 data with a total exposure of 97.7 kg·years. The COSINE-100 experiment, consisting of 106 kg of NaI(Tl) target material, is designed to carry out a model-independent test of DAMA/LIBRA's claim of WIMP discovery by searching for the same annual modulation signal using the same NaI(Tl) target. The crystal data show a 2.7 cpd/kg/keV background rate on average in the 2-6 keV energy region of interest. Using a χ-squared minimization method we observe best fit values for modulation amplitude and phase of 0.0092±0.0067 cpd/kg/keV and 127.2±45.9 d, respectively.

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

Cited by 32 publications

References 29 publications

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment

The COSINE-100 data acquisition system

Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment

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