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We report the first experimental results obtained with the new haloscope of the QUAX experiment located at Laboratori Nazionali di Frascati of INFN (LNF). The haloscope is composed of a OFHC Cu resonant cavity cooled down to about 30 mK and immersed in a magnetic field of 8 T. The cavity frequency was varied in a 6 MHz range between 8. 831496 and 8. 83803 GHz. This corresponds to a previously unprobed mass range between 36. 52413 and 36. 5511 eV. We don't observe any excess in the power spectrum and set limits on the axion-photon coupling in this mass range down to g₀ < 0. 861 10^-13 GeV^-1 with the confidence level set at 90\%.
Rettaroli et al. (Thu,) studied this question.