Angular distributions of the 63,65Cu(e, p0) reactions have been measured in the giant resonance energy region. The resulting differential cross sections have been decomposed into E1 and E2 components by a resonance model. The excitation functions for the two isotopes are significantly different, clearly reflecting threshold effects. The transition strengths of the low- and high-energy parts of the cross sections are reproduced by the statistical model and the direct-semidirect model, respectively, and the overall fit to the data is obtained by the sum of these two results.
- Nuclear reactions