Stripping of two protons and one alpha particle transfer reactions for (sup 16) O + (sup A) Sm and their influence on the fusion cross section

摘要

Transfer cross section angular distribution data for the stripping of two protons and one alpha particle are studied for the (sup 16) O + (sup A) Sm systems (A=144, 148, 150, 152 and 154), at near barrier energies. A semiclassical formalism is used to derive the corresponding transfer form factors. For only one channel the analysis shows evidences that the transfer reaction mechanism at backward angles - corresponding to small distances, may behave as a multi-step process leading to fusion. Simplified coupled channel calculations including transfer channels are performed for the study of the sub- barrier of these systems. The influence of short distance transfer reactions on the fusion is discussed. (author) 16 refs., 5 figs., 5 tabs.