Complete and incomplete fusion cross sections for 6 Li + 159 Tb have been measured at energies around the Coulomb barrier by the γ -ray method. The measurements show that the complete fusion cross sections at above-barrier energies are suppressed by ∼34% compared to coupled-channel calculations. A comparison of the complete fusion cross sections at above-barrier energies with the existing data for 11,10 B + 159 Tb and 7 Li + 159 Tb shows that the extent of suppression is correlated with the α separation energies of the projectiles. It has been argued that the Dy isotopes produced in the reaction 6 Li + 159 Tb at below-barrier energies are primarily due to the d transfer to unbound states of 159 Tb, while both transfer and incomplete fusion processes contribute at above-barrier energies.
Measurement of fusion cross sections for the 6,7 Li + 24 Mg reactions by the characteristic γray method has been done at energies from below to well above the respective Coulomb barriers. The fusion cross sections obtained from these γ-ray cross sections for the two systems are found to agree well with the total reaction cross sections at low energies. The decrease of fusion cross sections with increase of energy is consistent with the fact that other channels, in particular breakup open up with increase of bombarding energy. This shows that there is neither inhibition nor enhancement of fusion cross sections for these systems at above or below the barrier. The critical angular momenta (l cr ) deduced from the fusion cross sections are found to have an energy dependence similar to other Liinduced reactions. PACS number(s) : 25.70. Jj; 25.70. Gh Keywords: NUCLEAR REACTIONS 24 Mg( 6 Li,X), Ec.m. = 4.6-23.7 MeV; 24 Mg( 7 Li,X), Ec.m. = 5.2-22.9 MeV; measured σ γ ; deduced partial, total fusion σ, statistical model, optical model calculations and barrier penetration model calculations.
The inclusive cross sections of the α particles produced in the reaction 6 Li + 159 Tb have been measured at energies around the Coulomb barrier. The measured cross sections are found to be orders of magnitude larger than the calculated cross sections of 6 Li breaking into α and d fragments, thus indicating contributions from other processes. The experimental cross sections of 1n-stripping and 1n-pickup processes have been determined from an entirely different measurement, reported earlier. Apart from incomplete fusion and d-transfer processes, the 1n-stripping process is found to be a significant contributor to the inclusive α-particle cross sections in this reaction.
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