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- Title
Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment.
- Authors
Park, B. J.; Choi, J. J.; Choe, J. S.; Gileva, O.; Ha, C.; Iltis, A.; Jeon, E. J.; Kim, D. Y.; Kim, K. W.; Kim, S. K.; Kim, Y. D.; Ko, Y. J.; Lee, C. H.; Lee, H. S.; Lee, I. S.; Lee, M. H.; Lee, S. H.; Ra, S. J.; Son, J. K.; Shin, K. A.
- 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.
- Subjects
SOUTH Korea; DETECTORS; CRYSTAL growth; DARK matter
- Publication
European Physical Journal C -- Particles & Fields, 2020, Vol 80, Issue 9, pN.PAG
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-020-8386-8