Experimental Fusion Barrier Distributions Reflecting Projectile Octupole State Coupling to Prolate and Oblate Target Nuclei

Abstract

Fusion excitation functions have been measured spanning the entire barrier region in 1 MeV energy steps for the two systems ${}^{40}\mathrm{Ca}{+}^{192}\mathrm{Os},{}^{194}\mathrm{Pt}$. Precautions were taken to ensure sufficiently small errors to allow for extraction of the distribution of fusion barriers from the second differential of the product of E and $\ensuremath{\sigma}$. These results are compared with coupled channel calculations which take into account the most important degrees of freedom of both projectile and target. The influence of the prolate deformation of ${}^{192}\mathrm{Os}$ and the oblate deformation of ${}^{192}\mathrm{Pt}$ as well as the octupole vibration of ${}^{40}\mathrm{Ca}$ is apparent.