Tests on NaI(Tl) crystals for WIMP search at the Yangyang Underground Laboratory
K.W. Kim, W.G. Kang, S.Y. Oh, P. Adhikari, J.H. So, N.Y. Kim, H.S., Lee, S. Choi, I.S. Hahn, E.J. Jeon, H.W. Joo, B.H. Kim, H.J. Kim, Y.D. Kim,, Y.H. Kim, J.K. Lee, D.S. Leonard, J. Li, S.L. Olsen, H.S. Park
TL;DR
This paper reports initial results from ultra-low-background NaI(Tl) crystal detectors tested at the Yangyang Underground Laboratory, aiming to clarify the WIMP detection signal observed by DAMA and address conflicting experimental results.
Contribution
It presents the first measurements of NaI(Tl) crystals at Yangyang Underground Laboratory for dark matter search, focusing on reducing background noise.
Findings
Development of ultra-low-background NaI(Tl) detectors
Initial measurement results at Yangyang Underground Laboratory
Progress towards clarifying DAMA's annual modulation signal
Abstract
Among the direct search experiments for WIMP dark matter, the DAMA experiment observed an annual modulation signal interpreted as WIMP interactions with 9.2 significance. However, this result is contradictory with other direct search experiments reporting null signals in the same parameter space allowed by the DAMA observation, necessitating clarification of the origin of the modulation signal observed using the NaI(Tl) crystals of the DAMA experiment independently. Here, we report the first results of NaI(Tl) crystal measurement at the Yangyang Underground Laboratory to grow ultra-low-background NaI(Tl) crystal detectors.
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