First Limits on Axion Dark Matter from a DALI Prototype

Abstract

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 $g_{a{\hat{I}}^3{\hat{I}}^3}\lesssim 1.27\times 10^{-11}{\mathrm{GeV}}^{-1}$ at 28.54 $\hat{I}¼$eV. These results consolidate the DALI approach and motivate a next-stage haloscope to explore a broader mass range with upgraded instrumentation.

10 pages, 5 figures, 2 tables