Excitation Functions for Alpha-Induced Reactions on Zinc-64

Eleven excitation functions for alpha-induced reactions on Zn⁶⁴ have been measured up to incident energies of 41 Mev. The values of σ(α, p)σ(α, n) and σ(α, pn)σ(α, 2n) in the region of maximum yield were found to be 1.7 and 9, respectively. Reactions involving alpha-particle emission account for about 20% of the total inelastic cross section at 40 Mev. The total inelastic cross section was found to agree with calculated values for r₀=1.6×10^-13 cm. The competition between different reactions was analyzed in terms of the statistical theory by use of a level density expression of the form W(E)=Cexp2[a(E-δ)]1/2. Values of a ranging from 0.8 to 2.8 were required to fit the experimental results, indicating that the statistical theory is not completely applicable.