TRANSFER-REACTIONS AS A DOORWAY TO FUSION

This paper discusses the role played by transfer reactions on the sub- barrier fusion enhancement. A semiclassical formalism is used to deriv e the transfer form factors, that are used in coupled-channel calculat ions. It is shown that transfer reactions that take place at small dis tances may be an important doorway to fusion. The relation between thi s formalism and the long-range absorptive fusion potential is also dis cussed. Results of calculations for the O-16 + Sm-A, S-32 + Mo-100 and O-16 + Co-59 systems are presented.