Evidence for Δ-h Components from Pion Reactions
The role of excited baryon resonances (such as the Δ3,3) in nuclear matter is an important problem which is not yet fully understood. Although much theoretical work has been done in this field,1–5 there are few experimental tests. The most convincing experimental confirmation of the influence of deltas on the properties of low lying nuclear states is the quenching of the Gamow-Teller strength recently observed in (p,n) reactions.6–7 Because of uncertainties in the Gamow-Teller sum rule this quenching does not lead to direct estimates of the Δ-nucleus admixtures.
KeywordsAngular Distribution Nuclear State Cross Section Ratio Admixture Coefficient Double Charge Exchange
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