Speaker
Giuseppe Ruoso
(Istituto Nazionale di Fisica Nucleare)
Description
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 ma ≃ 42 μeV. 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 ma > 40 μeV. In this talk I will mainly focus on the description of the experimental apparatus, with a short final illustration of the data analysis and results.