Charged pion photoproduction is proposed as a new method to study halo
nuclei. In particular, it is demonstrated that the reaction O-17(gamm
a, pi(-))F-17(1+/2, 0.495 MeV) is well suited to investigate the well-
known proton halo in F-17 which is not amenable to radioactive beam ex
periments. The cross sections are shown to be very sensitive to the ha
lo structure of the loosely bound proton.