Speaker
Prof.
giovanni carugno
(INFN & Padova University)
Description
In the QUAX experiment, dark matter axions are searched by means of their
resonant interactions with electronic spins in a magnetized sample. In
principle axion-induced magnetization changes can be detected embedding a
sample in a rf cavity under a static magnetic field. In this presentation we describe
the operation of a prototype ferrimagnetic haloscope, whose sensitivity is
limited only by thermal effects. With a preliminary axion search, we are able
to produce an upper limit on cosmological DSFZ axions of gaee < 4.9 × 10^-10 at
90% C.L. for an axion mass of 58 microeV (i.e. 14 GHz) and assuming a local DM
density of 0.45 GeV/cm^3. This is the first reported measurement of the
coupling between cosmological axions and electronic spins. Some preliminary measurements with a NbTi superconducting cavity will be presented.
Primary author
Prof.
giovanni carugno
(INFN & Padova University)
Co-author
Dr
giuseppe ruoso
(INFN)