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Korea Invisible Mass Search
The Korea Invisible Mass Search (KIMS Collaboration), is a South Korean experiment, led by Sun Kee Kim, searching for Weakly interacting massive particles (WIMPs), one of the strongest candidates for dark matter.[1] The experiments use CsI(Tl) crystals at YangYang Underground Laboratory, in tunnels from a preexisting underground power plant.[2] KIMS is supported by the Creative Research Initiative program of the Korea Science and Engineering Foundation. It is the first physics experiment located, and largely built, in Korea.[3]
Other research topics include detector development for a neutrinoless double beta decay search and the creation of an extreme low temperature diamond calorimeter.
History
The KIMS experiment was funded in 2000 to search for WIMP dark matter. To avoid the cost of creating a new underground tunnel for testing, the Yangyang Pumped Storage Power Plant belonging to Korea Middleland Power Co. in Yangyang, Korea was used. Construction was completed in 2003. The CsI(Tl) scintillating crystal used has a high light yield is affordable for large mass. After a substantial effort for the initial setup and crystal development, KIMS began recording data in 2004 with one full-size 6 kg crystal.[2] A 4 crystal setup was ran in 2005-2006 to optimize the WIMP search. In 2008, the 12 crystal array with mass 103.4 kg was completed and ran until December 2012 for a detector upgrade replacing the PMTs.
Results
The first WIMP cross section search was published in 2006 using the one crystal data.[4] New limits were presented in 2007 and 2012,[5] inconsistent with the DAMA signal reports for masses above 20 Gev. Using 24324.3 kg days exposure, low-mass WIMP signals below 20 GeV were disfavored[6] in 2014.
References
The Journal of the Korean Physical Society. Korean Physical Society. 2005.
Kiwoon Choi; Jihn E. Kim; Dongchul Son (12 December 2005). Particles, Strings and Cosmology: 11th International Symposium on Particles, Strings and Cosmology; PASCOS 2005. Springer. pp. 75â81. ISBN 978-0-7354-0295-9.
Symmetry: Dimensions of Particle Physics. Fermi National Accelerator Lab. 2006.
KIMS Collaboration (Feb 9, 2006). "First limit on WIMP cross section with low background CsI(Tâ) crystal detector". Phys. Lett. B. arXiv:astro-ph/0509080. Bibcode:2006PhLB..633..201K. doi:10.1016/j.physletb.2005.12.035.
"New Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors". Phys. Rev. Lett. 108, 181301. 30 April 2012. arXiv:1204.2646. Bibcode:2012PhRvL.108r1301K. doi:10.1103/PhysRevLett.108.181301.
H.âS. Lee et al. (KIMS Collaboration) (23 September 2014). "Search for low-mass dark matter with CsI(Tl) crystal detectors". Phys. Rev. D 90, 052006. arXiv:1404.3443. Bibcode:2014PhRvD..90e2006L. doi:10.1103/PhysRevD.90.052006.
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