Performance of an ultra-pure NaI(Tl) detector produced by an indigenously-developed purification method and crystal growth for the COSINE-200 experiment

Lee, H.; Park, B. J.; Choi, J. J.; Gileva, Olga; Ha, C.; Iltis, Alain; Jeon, E. J.; Kim, D. Y.; Kim, K. W.; Kim, S. H.; Kim, S. K.; Kim, Y. D.; Ko, Y. J.; Lee, C. H.; Lee, H. S.; Lee, I. S.; Lee, M. H.; J., S.; Son, J. K.; Shin, K. A.

doi:10.3389/fphy.2023.1142765

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…An initial chemical purification of raw NaI powder, based on a recrystallization method, has resulted in a sufficient reduction of K and Pb [20], and a large scale facility has already been assembled [21] and is in stable operation [22]. A proof of crystallization with sufficiently low levels of 40 K and 210 Pb has been demonstrated with a small crystal grower for approximately 1 kg-size crystal ingot [23,24]. Crystallization for a 10 kg-size detector is currently under development.…”

Section: Cosine-100 Experimentsmentioning

confidence: 99%

COSINE-100 experiment

Lee

2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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COSINE-100 is a direct search experiment for weakly interacting massive particles (WIMPs) using 106 kg of low-background NaI(Tl) crystal detectors. The experiment commenced its physics operation in September 2016 and concluded in March 2023. Its primary objective was either reproduce or refute the annual modulation signals observed by the DAMA experiment. However, initial three years of COSINE-100 data did not yield clear signals attributable to WIMP interactions and showed inconsistent results compared to DAMA's observations, assuming the canonical WIMP dark matter model. Nevertheless, the model-independent test of annual modulation has not yet reached a final conclusion. In this proceeding, we will discuss the recent progress made in the COSINE-100 experiment and outline future prospects.

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Section: Cosine-100 Experimentsmentioning

confidence: 99%

COSINE-100 experiment

Lee

2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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“…Using developed technology, we have produced about 480 kg of the low-background powder with a production capability of 35 kg per 2 weeks. Using the purified NaI powder, the radioactive background was reduced at least twice in a small size of NaI(Tl) crystal relative to the COSINE-100 crystals [32]. This report summarizes our experience, describes the mass purification facility, optimized raw powder purification, and the recovery of NaI from the mother solution and residual melt.…”

Section: Introductionmentioning

confidence: 98%

Mass production of ultra-pure NaI powder for COSINE-200

et al. 2023

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COSINE-200 is the next phase experiment of the ongoing COSINE-100 that aims to unambiguously verify the annual modulation signals observed by the DAMA experiment and to reach the world competitive sensitivity on the low-mass dark matter search. To achieve the physics goal of the COSINE-200, the successful production of the low-background NaI(Tl) detectors is crucial and it must begin from the mass production of the ultra-low background NaI powder. A clean facility for mass-producing the pure-NaI powder has been constructed at the Center for Underground Physics (CUP) in Korea. Two years of operation determined efficient parameters of the mass purification and provided a total of 480 kg of the ultra-pure NaI powder in hand. The potassium concentration in the produced powders varied from 5.4 to 11 ppb, and the maximum production capacity of 35 kg per 2 weeks was achieved. Here, we report our operational practice with the mass purification of the NaI powder, which includes raw powder purification, recycling of the mother solution, and recovery of NaI from the residual melt after crystal growth.

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Yemilab, a new underground laboratory in Korea

Kim,

Lee

2024

AAPPS Bull.

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In September 2022, Yemilab, a new underground laboratory, was finally completed in Jeongseon, Gangwon Province, South Korea. Situated at a depth of 1000 m, it boasts an exclusive experimental area of 3000 m2. Currently, preparations are in progress for the AMoRE-II experiment, which aims to investigate neutrinoless double beta decay, as well as for the COSINE-100 upgrade (COSINE-100U), a direct dark matter detection experiment. Both experiments are scheduled to commence in the second quarter of 2024 at Yemilab. Furthermore, the facility encompasses a cylindrical pit, approximately 6300 m3 in volume, designed to serve as a multipurpose laboratory. This laboratory will facilitate next-generation experiments focusing on neutrinos, dark matter, and related areas of research. This article presents a detailed overview of Yemilab’s construction, infrastructure, and its pivotal physics programs.

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Performance of an ultra-pure NaI(Tl) detector produced by an indigenously-developed purification method and crystal growth for the COSINE-200 experiment

Cited by 6 publications

References 41 publications

COSINE-100 experiment

COSINE-100 experiment

Mass production of ultra-pure NaI powder for COSINE-200

Yemilab, a new underground laboratory in Korea

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