Abstract
Gamow-Teller (GT) transitions are discussed in the context of the nuclear shell model. It is pointed out that the GT strength function contains information both about the character of the nuclear constituents and about the effective residual nucleon-nucleon force. A major part of the strength function is inaccessible to beta decay, but the (p,n) reaction can be used to probe GT transitions without the energetic limitations of beta decay. The experimental techniques are reviewed. The (p,n) data are surveyed. Only about 55% of the sum rule strength is seen. The possibility that the missing strength signifies the presence of delta or quark degrees of freedom in the constituent particles of the nuclear model is discussed.
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