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Measurements of the ('He, n) reaction have been carried out on a number of odd-Z targets in the vicinity of the closed proton shell at Z=50. For the targets ' ' Ag and "" In, the results can be interpreted in terms of the coupling of proton particles or holes to the known pairing vibrational states in neighboring tin nuclei. For targets of ' " Sb, the expected I.=0 transition strength is observed, but is found to be spread over several final states.

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