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.

Details

Title
Development of ultra-pure NaI(Tl) detectors for the COSINE-200 experiment
Author
Park, B J 1 ; Choi, J J 2 ; Choe, J S 3 ; Gileva, O 3 ; Ha C 4 ; Iltis, A 5 ; Jeon, E J 3 ; Kim, D Y 3 ; Kim, K W 3 ; Kim, S K 2 ; Kim, Y D 1 ; Ko, Y J 3 ; Lee, C H 3 ; Lee, H S 1   VIAFID ORCID Logo  ; Lee, I S 3 ; Lee, M H 1 ; Lee, S H 1 ; Ra, S J 3 ; Son, J K 3 ; Shin, K A 3 

1  University of Science and Technology (UST), IBS School, Daejeon, Republic of Korea (GRID:grid.412786.e) (ISNI:0000 0004 1791 8264); Institute for Basic Science (IBS), Center for Underground Physics, Daejeon, Republic of Korea (GRID:grid.410720.0) (ISNI:0000 0004 1784 4496) 
2  Seoul National University, Department of Physics and Astronomy, Seoul, Republic of Korea (GRID:grid.31501.36) (ISNI:0000 0004 0470 5905) 
3  Institute for Basic Science (IBS), Center for Underground Physics, Daejeon, Republic of Korea (GRID:grid.410720.0) (ISNI:0000 0004 1784 4496) 
4  Chung-Ang University, Department of Physics, Seoul, Republic of Korea (GRID:grid.254224.7) (ISNI:0000 0001 0789 9563) 
5  Damavan Imaging, Troyes, France (GRID:grid.254224.7) 
Publication year
2020
Publication date
Sep 2020
Publisher
Springer Nature B.V.
ISSN
14346044
e-ISSN
14346052
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1140/epjc/s10052-020-8386-8
ProQuest document ID
2473253454
Copyright
© The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.