Can we learn about the spin flip giant dipole resonances with pions?

This paper describes theoretical studies performed which have predicted the existence of large differences in the angular distribution shapes of ΔS = 1,1- and ΔS = 0,1- transitions. At forward angles these two angular distributions are nearly out of phase. The preliminary data on the 18O(π,π')18O(1-,4.45 MeV) angular distribution at 164 MeV and in the region 200-600 has a shape which looks very much like the calculations for ΔS = 1,1- states. For the study of spin flip components of the giant dipole resonance, the differences in angular distribution shapes between ΔS = 0,1-, ΔS = 1,1- and ΔS = 1,2- transitions offers a powerful method for separating these components experimentally. Data and calculations for the 40Ca(π+-,π0) reactions at 164 MeV are shown which also indicate that pion scattering possesses a unique signature identifying the 1- and 2- spin-isospin components of the giant dipole resonance