Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with NaI(Tl) crystal Detectors
K.W. Kim, G. Adhikari, P. Adhikari, S. Choi, C. Ha, I.S. Hahn, E.J., Jeon, H.W. Joo, W.G. Kang, H.J. Kim, N.Y. Kim, S.K. Kim, Y.D. Kim, Y.H. Kim,, Y.J. Ko, H.S. Lee, J.S. Lee, J.Y. Lee, M.H. Lee, D.S. Leonard, S.L. Olsen,, B.J. Park, H.K. Park, H.S. Park, K.S. Park
TL;DR
This study sets new upper limits on WIMP-nucleon interaction cross sections using NaI(Tl) detectors, partially constraining the parameter space relevant to dark matter searches and challenging some previous claims.
Contribution
It provides the first direct limits on WIMP interactions with sodium in NaI(Tl) detectors at the Yangyang Underground Laboratory.
Findings
No nuclear recoil signals observed.
Upper limit on WIMP-nucleon cross section is 3.26×10^-4 pb at 10 GeV/c^2.
Partially excludes the DAMA/LIBRA WIMP interaction region.
Abstract
Limits on the cross section for weakly interacting massive particles (WIMPs) scattering off nucleons in the NaI(Tl) detectors at the Yangyang Underground Laboratory are obtained with a 2967.4 kg*day data exposure. Nuclei recoiling are identified by the pulse shape of scintillating photon signals. Data are consistent with no nuclear recoil hypothesis, and 90% confidence level upper limits are set. These limits partially exclude the DAMA/LIBRA region of WIMP-sodium interaction with the same NaI(Tl) target detector. This 90% confidence level upper limit on WIMP-nucleon spin-independent cross section is 3.26*10^-4 pb for a WIMP mass at 10 GeV/c^2.
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