Final-state effects in the radio frequency spectrum of strongly interacting fermions

We model the impact of final-state interactions on the radio frequency spectrum of a strongly interacting two-component superfluid Fermi gas. In addition to a broad asymmetric peak coming from the breakup of Cooper pairs, we find that, for appropriate parameters, one can observe a sharp symmetric "bound-bound'' spectral line coming from the conversion of Cooper pairs in one channel to pairs or molecules in another.