Abstract

Fusion excitation functions for 16O on 176,180Hf and 182,184,186W have been measured over an energy range spanning the fusion barrier. Contrary to expectation, the sub-barrier cross sections are systematically lower for the nuclei with larger quadrupole deformations, beta 2. These cross sections are also significantly higher than those calculated using a model which takes beta 2 deformations into account; similar comparisons for other reactions, including 16O on 152,154Sm, show no such enhancement. The authors suggest that fusion enhancement due to the negative hexadecapole deformations of the Hf and W nuclei may have been observed for the first time.

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