Spin-isospin excitations

We discuss the spin-isospin response in 3 regions. The Gamow-Teller strength distribution is still not understood. New data from ( n , p ) reactions question the conjecture that part of the missing strength was to be found in the high energy tail region. In the quasielastic region rather different sets of data suggest that the attraction in the spin longitudinal channel is gone. In the Δ-region the existing data are consistent with an attractive Δ-hole interaction in the spin longitudinal channel.