Abstract
Abstract Cross sections for evaporation residues following the complete fusion of the 12 C + 12 C, 14 N + 12 C and 15 N + 12 C systems have been measured with a E − ΔE counter telescope in a wide range of incident energies. They are fairly well reproduced by evaporation calculations based on the statistical theory. The total fusion excitation function of the 12 C + 12 C system shows strong structure, which is compared to the predictions of the reaction cross sections derived from coupled channel calculations and to the integrated inelastic cross sections. Critical angular momenta have been obtained from the fusion cross-section data and these values are discussed in the framework of compound nucleus and entrance channel effects. A striking difference is observed between the fusion cross sections of the 14 N + 12 C and 15 N + 12 C systems and shows the importance of the valence nucleons of colliding ions in the fusion process. A possible interpretation might be the influence of the yrast line of the compound nuclei.
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