Threshold Effects in Proton-induced Reactions on Copper

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Abstract
A study has been made of proton-induced reactions on the two copper isotopes 65CU and 63CU for bombarding energies in the range 1�2-4�6 MeV. This energy range includes the (p,n) thresholds for 65CU and 63CU, which occur at 2�17MeV and 4�21 MeV respectively. Excitation functions for (p, y) reactions were obtained by observing discrete y-ray transitions between low-lying states of the compound nuclei. Data were also obtained for the charged-particle reactions 65Cu(p,lXo)62Ni and 63CU(p, lXo.,)6�Ni. As the respective (p, n) thresholds are crossed, the yields of proton-induced reactions on 65CU fall by a factor of about 5 while the excitation functions of proton-induced reactions on 63CU reveal no evidence of a significant threshold effect. These data are ompared with Hauser-Feshbach statistical model calculations. The structure in the 65CU+p reaction yield is interpreted in terms of Wigner cusps.

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