Analog of the T_> giant dipole resonance in light nuclei

Giant resonances were observed in (π⁺,π^-) double charge exchange on ¹³C, ²⁷Al, and ⁵⁹Co at excitation energies of 8.8, 14.2, and 27.9 MeV, respectively, where the giant dipoles built on the isobaric analog states are expected to appear. Partial angular distributions were measured for both ¹³C and ²⁷Al and observed to have a dipole shape. The resonance on the T=1/2 targets has a single isospin value (T=3/2) and is the analog of the T_> giant dipole state in the above nuclei. The results are in good agreement with photonuclear reactions and indicate a new general method for an accurate determination of the T_>=T+1 giant dipole state in T=1/2 nuclei.