First Limits on Axion Dark Matter from a DALI Prototype

We report a pilot dark-matter search with a cryogenic, magnetized, scaled-down DALI prototype. An analysis of 36 hours of data reveals no statistically significant excess attributable to axionlike particles. We therefore set new exclusion limits in the 6.883–6.920 GHz band, reaching an axion-photon coupling sensitivity of $g_{a\gamma \gamma }\lesssim 1.27\times {10}^{-11}{\mathrm{G}\mathrm{e}\mathrm{V}}^{-1}$ at 28.54 $\mu$eV. These results consolidate the DALI approach and motivate a next-stage haloscope to explore a broader mass range with upgraded instrumentation.