Detection of the BCS transition in a trapped Fermi gas

We investigate theoretically the quasiparticle properties of a trapped gas of fermionic atoms in both the normal and the superfluid phases. Our analys is, which accounts for the shell structure of the normal phase spectrum, sh ows that the single-particle response of the gas to a modulation of the tra pping frequency should indicate the onset of superfluidity. The results are discussed in the context of current experiments on trapped Fermi gases.