Tests on NaI(Tl) crystals for WIMP search at the Yangyang Underground Laboratory

Among the direct searches for WIMP-type dark matter, the DAMA experiment is unique in that it has consistently reported a positive signal for an annual-modulation signal with a large (9.3σ) statistical significance. This result is controversial because if it is interpreted as a signature for WIMP in...

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Bibliographic Details
Published in:Astroparticle physics 2015-03, Vol.62, p.249-257
Main Authors: Kim, K.W., Kang, W.G., Oh, S.Y., Adhikari, P., So, J.H., Kim, N.Y., Lee, H.S., Choi, S., Hahn, I.S., Jeon, E.J., Joo, H.W., Kim, B.H., Kim, H.J., Kim, Y.D., Kim, Y.H., Lee, J.K., Leonard, D.S., Li, J., Olsen, S.L., Park, H.S.
Format: Article
Language:English
Subjects:
Dark Matter
KIMS
NaI(Tl) crystal
WIMP
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Summary:Among the direct searches for WIMP-type dark matter, the DAMA experiment is unique in that it has consistently reported a positive signal for an annual-modulation signal with a large (9.3σ) statistical significance. This result is controversial because if it is interpreted as a signature for WIMP interactions, it conflicts with other direct search experiments that report null signals in the regions of parameter space that are allowed by the DAMA observation. This necessitates an independent verification of the origin of the observed modulation signal using the same technique as that employed by the DAMA experiment, namely low-background NaI(Tl) crystal detectors. Here, we report first results of a program of NaI(Tl) crystal measurements at the Yangyang Underground Laboratory aimed at producing NaI(Tl) crystal detectors with lower background levels and higher light yields than those used for the DAMA measurements.
ISSN:0927-6505
1873-2852
DOI:10.1016/j.astropartphys.2014.10.004