The COSINE-100 data acquisition system

Adhikari, G.; Adhikari, P.; Souza, E. Barbosa de; Carlin, N.; Choi, S.; Choi, W.; Djamal, Mitra; Ezeribe, A. C.; Ha, C.; Hahn, I. S.; Hubbard, Allyn E.; Jeon, E. J.; Jo, J. H.; Joo, Hyun-Woo; Kang, W. G.; Kang, W.S.; Kauer, M.; Kim, Heonoh; Kim, H.J.; Kim, K.W.; Kim, M.C.; Kim, N.Y.; Kim, S.K.; Kim, Y.D.; Kim, Yoon Hak; Kudryavtsev, V. A.; Lee, H.S.; Lee, J.; Lee, M.H.; Lim, K. E.; Leonard, D. S.; Maruyama, R.; Mouton, F.; Na, S.; Olsen, S. L.; Park, H.K.; Park, H.S.; Park, J.S.; Park, K.S.; Pettus, W.; Prihtiadi, H.; Rott, C.; Scarff, A.; Spooner, N. J. C.; Thompson, W. G.; Yang, L.

doi:10.1088/1748-0221/13/09/p09006

Cited by 37 publications

(31 citation statements)

References 16 publications

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“…For each SADC channel this corresponds to the maximum integrated charge within an 8 μs search window and to the associated time of that maximum. This system has been used in COSINE-100 experiment and descriptions are provided elsewhere [26,44].…”

Section: Electronicsmentioning

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: Electronicsmentioning

confidence: 99%

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

et al. 2020

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“…The COSINE-100 experiment aims to resolve this tension in the field by performing a model-independent test of DAMA's observation using the same detector material, NaI(Tl), as DAMA. Previously, we have performed a model-dependent test of DAMA and found that DAMA's observed annual modulation cannot be explained by spinindependent WIMP-nucleus scattering in the context of the standard halo model [22]. Additionally, there are several other experiments aimed at performing modelindependent tests of DAMA, including DM-Ice17 [23], KIMS [24], SABRE [25], and ANAIS-112 [26,27], which has recently reported its first result.…”

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confidence: 99%

“…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]. These eight crystals are referred to as Crystal 1 (C1) to Crystal 8 (C8).…”

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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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“…1 (a), was taken to be the difference between the Xu et al and Joo et al measurements. In the case of the COSINE-100 data, the Joo et al results were used because these measurements used a crystal from the same ingot, the same data aquisition system [46], and the same analysis framework as the COSINE-100 experimental data. We use the modulation amplitude results from DAMA/LIBRA-phase1 [10] and phase2 [11], as rebinned in Ref.…”

Section: Quenching Factor Model and Implications For The Interpretatimentioning

confidence: 99%

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

Adhikari

et al. 2019

J. Cosmol. Astropart. Phys.

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There is a long standing debate about whether or not the annual modulation signal reported by the DAMA/LIBRA collaboration is induced by Weakly Interacting Massive Particles (WIMP) in the galaxy's dark matter halo scattering from nuclides in their NaI(Tl) crystal target/detector. This is because regions of WIMP-mass vs. WIMP-nucleon crosssection parameter space that can accommodate the DAMA/LIBRA-phase1 modulation signal in the context of the standard WIMP dark matter galactic halo and isospin-conserving (canonical), spin-independent (SI) WIMP-nucleon interactions have been excluded by many of other dark matter search experiments including COSINE-100, which uses the same NaI(Tl) target/detector material. Moreover, the recently released DAMA/LIBRA-phase2 results are inconsistent with an interpretation as WIMP-nuclide scattering via the canonical SI interaction and prefer, instead, isospin-violating or spin-dependent interactions. Dark matter interpretations of the DAMA/LIBRA signal are sensitive to the NaI(Tl) scintillation efficiency for nuclear recoils, which is characterized by so-called quenching factors (QF), and the QF values used in previous studies differ significantly from recently reported measurements, which may have led to incorrect interpretations of the DAMA/LIBRA signal. In this article, the compatibility of the DAMA/LIBRA and COSINE-100 results, in light of the new QF measurements is examined for different possible types of WIMP-nucleon interactions. The resulting allowed parameter space regions associated with the DAMA/LIBRA signal are explicitly compared with 90% confidence level upper limits from the initial 59.5 day COSINE-100 exposure. With the newly measured QF values, the allowed 3σ regions from the DAMA/LIBRA data are still generally excluded by the COSINE-100 data.

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The COSINE-100 data acquisition system

Cited by 37 publications

References 16 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

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

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

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