A search for cosmological axions has been performed by scanning a frequency region of 38 MHz centered at about 10.2 GHz, corresponding to an axion mass m(a)similar or equal to 42 mu eV. The QUAX experimental apparatus, a haloscope comprised of a 1-liter volume tunable cavity immersed in an 8 T magnetic field and a quantum-limited detection chain, set limits on the axion-photon coupling at the 10(-14) GeV-1 level. As no signal candidate has been observed, viable hadronic axion models are ruled out in a currently preferred postinflationary region m(a)>40 mu eV.
Search for Postinflationary QCD Axions with a Quantum-Limited Tunable Microwave Receiver
Sardo Infirri G.
;Braggio C.;Maiello D.;
2025
Abstract
A search for cosmological axions has been performed by scanning a frequency region of 38 MHz centered at about 10.2 GHz, corresponding to an axion mass m(a)similar or equal to 42 mu eV. The QUAX experimental apparatus, a haloscope comprised of a 1-liter volume tunable cavity immersed in an 8 T magnetic field and a quantum-limited detection chain, set limits on the axion-photon coupling at the 10(-14) GeV-1 level. As no signal candidate has been observed, viable hadronic axion models are ruled out in a currently preferred postinflationary region m(a)>40 mu eV.
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