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

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Title
Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment
Author(s)
Byungju Park; Choi, JJ; Jun Seok Choe; Olga Gileva; Ha, C; Iltis, A; Eun Ju Jeon; Daeyeon Kim; Kyungwon Kim; Kim, SK; Kim, Yeongduk; Ko, Young Ju; Lee Cheol Ho; Lee, Hyun Su; Lee, In Soo; Lee, Moo Hyun; Lee, Seo Hyun; Ra, Se Jin; Son, Jukyung; Shin, Keonah
Publication Date
2020-09
Journal
EUROPEAN PHYSICAL JOURNAL C, v.80, no.9, pp.814
Publisher
SPRINGER
Abstract
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) thallium-doped 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
URI
https://pr.ibs.re.kr/handle/8788114/8942
DOI
10.1140/epjc/s10052-020-8386-8
ISSN
1434-6044
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > 1. Journal Papers (저널논문)
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