  We study Bragg scattering of laser light by trapped Fermi atoms having two
hyperfine spin components in the unitarity-limited strongly interacting regime
at zero temperature. We calculate the dynamic structure function of the
superfluid trapped Fermi gas in the unitarity limit. Model calculation using
local density approximation shows that, the superfluid pairing gap in the
unitarity limit is detectable from the measurements of dynamic structure
function by Bragg spectroscopy, while in the weak-coupling BCS limit, the gap
eludes such spectroscopic detection.
