[en] In order to look for the projectile structure effect on ICF reactions in the present experiments the excitation functions of radio-nuclides populated during the interactions of ¹⁸O+¹⁵⁹Tb at energies ≈ 4-7 MeV/A have been measured. The present data will be compared with ¹⁶O+¹⁵⁹Tb data, to draw some conclusion about alpha-Q-value systematics, as ¹⁸O has more negative Q_α-value than ¹⁶O. In these experiments the activation technique has been used. The targets of ¹⁵⁹Tb of thickness ≈ 1.5 - 2.0 mg/cm² and Al-catchers (≈1.5-2.5 mg/cm²) were prepared by rolling method