  Experiments on pion (Goldstone Boson) photoproduction from the nucleon tests
the ability to make QCD predictions at confinement scale energies. Experiments
with both polarized beams and targets have the potential sensitivity to
demonstrate the dynamic isospin breaking effects of the up and down quark mass
difference, whereas experiments on Compton scattering from the nucleon will
incisively probe its chiral structure by measuring all of the spin dependent
amplitudes. These and other types of photo-induced measurements on nuclei could
be possible at BLAST with the addition of an almost-real photon tagging system
and a forward low energy recoil ion hodoscope.
