  The superfluid, pair condensed spin-1/2 Fermi gases are supposed to exhibit
at nonzero wave vector a still unobserved collective excitation mode in their
pair-breaking continuum. Using BCS theory at zero temperature and in the long
wavelength limit, we predict that this mode is quantitatively observable (in
frequency, width and spectral weight) in the response of a cold atom gas to a
laser Bragg excitation, if one measures the perturbation induced on the order
parameter modulus rather than on the density.
