The Korea Invisible Mass Search (KIMS) experiment presents new limits on the weakly interacting massive particle (WIMP)-nucleon cross section using data from an exposure of $3409\mathrm{kg}·\mathrm{d}$ taken with low-background CsI(Tl) crystals at the Yangyang Underground Laboratory. The most stringent limit on the spin-dependent interaction for a pure proton case is obtained. The DAMA signal region for both spin-independent and spin-dependent interactions for the WIMP masses greater than $20\mathrm{GeV}/c^2$ is excluded by the single experiment with crystal scintillators.

• Received 3 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.091301