Abstract
Abstract Energy spectra of protons emitted in the reactions of 64 Zn, 66 Zn, 68 Zn, and 70 Zn with 12.5 MeV protons and 18 MeV 4 He ions were measured between 30° and 150° to the beam. The contribution of the precompound process was determined on the basis of the asymmetry in the angular distribution and by comparison of the spectra with calculations based on the compound and precompound models. Both methods indicate that the contribution of this process increases from ≈5% for 64 Zn to ≈20% for 70 Zn. The ratio of proton to neutron evaporation widths is found to depend strongly on target neutron number and a correlation is established with the corresponding seperation energies.
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