New Experimental Limits on Strongly Interacting Massive Particles at the TeV Scale

We have carried out a search for strongly interacting massive particles (SIMPs) bound to Au and Fe nuclei, which could manifest themselves as anomalously heavy isotopes of these elements. Our samples included gold from the NASA Long Duration Exposure Facility satellite, RHIC at Brookhaven National Laboratory, and from various geological sources. We find no evidence for SIMPs in any of our samples, and our results set stringent limits (as low as $\sim {10}^{-12\mathrm{}}$) on the abundances of anomalous Au or Fe isotopes with masses up to 1.67 and $0.65\mathrm{TeV}{/c}^2$, respectively.