Abstract
Energy spectra of ..cap alpha.. particles emitted in the reactions of /sup 64/Zn, /sup 66/Zn, /sup 68/Zn, and /sup 70/Zn with 12.5 MeV protons and 18 MeV /sup 4/He ions were measured between 30/sup 0/ and 150/sup 0/ 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 with target neutron number and is of greatest importance for the (..cap alpha..,..cap alpha..') reaction. The ratio of ..cap alpha.. to neutron evaporation widths is found to depend strongly on target neutron number and a correlation is established with the corresponding separation energies.
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