Abstract
The recent progress in the study of nuclear spin excitations is reviewed. The (e, e') measurement of the giant Ml state in 48Ca and the systematics of the giant Gamow-Teller state seen in the intermediate energy (p, n) reaction give a clear picture of the spin-dependent dynamics. The effective interaction strength is consistent with previous knowledge of the nuclear force. However, the excitation strengths are much smaller than shell-model theory predicts. This may be understood at least partially by considering additional hadronic degrees of freedom.
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