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We report new results from the Cryogenic Dark Matter Search (CDMS II) at theSoudan Underground Laboratory. Two towers, each consisting of six detectors,were operated for 74.5 live days, giving spectrum-weighted exposures of 34 kg-dfor germanium and 12 kg-d for silicon targets after cuts, averaged over recoilenergies 10-100 keV for a WIMP mass of 60 GeV. A blind analysis was conducted,incorporating improved techniques for rejecting surface events. No WIMP signalexceeding expected backgrounds was observed. When combined with our previousresults from Soudan, the 90% C.L. upper limit on the spin-independentWIMP-nucleon cross section is 1.6 x 10^{-43} cm^2 from Ge, and 3 x 10^{-42}cm^2 from Si, for a WIMP mass of 60 GeV. The combined limit from Ge (Si) is afactor of 2.5 (10) lower than our previous results, and constrains predictionsof supersymmetric models.Comment: 4 pages, 4 figures, submitted to Phys. Rev. Let

physical review letters

Limits on Spin-Independent Interactions of Weakly Interacting Massive Particles with Nucleons from the Two-Tower Run of the Cryogenic Dark Matter Search