We propose a microscopic calculation of fusion reactions for alpha + Au-197, alpha +Pb-208, alpha + Bi-209, and alpha +(238) U systems. Inspired by recent studies of a-cluster decay in radioactive nuclei [Phys. Rev. C 95, 061306(R) (2017)], a Pauli blocking term depending on the density overlap of projectile and target nuclei is introduced in addition to the strong and electromagnetic interactions between them. As compared to the a-core potential obtained from the double-folding potential with standard Michigan-3-Yukawa-Reid effective nucleon-nucleon interaction, the one including the Pauli blocking interaction results in a shallow "pocket" in the inner part. On account of highlighting the density dependence of Pauli blocking potential, we make a comparison of fusion cross sections between two extreme neutron density distributions of target nuclei, namely, (i) "skin type" with same diffuseness but different half-density radii in density distributions of proton and neutron, and (ii) "halo type" with same half-density radii but different diffuseness. The fusion cross sections resulting from the potential considering Pauli blocking effects are also compared with the experimental data in detail.
展开▼
