Nuclear Physics A572 ( 1994) 459-476 North-Holland zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA NUCLEAR PHYSICS A From fission to scattering in the looMo ( 18.7 MeV/u) + looMo reaction within a microscopic dynamic approach F. Haddad, G. Royer, F. Sebille, B. Remaud ~~orata~re de Physique N~el~aire, IN2P3/CNR~ et University de Nantes, 2, rue de la ~oussin~~re, 44072 Nantes cedex 03, France Received 29 July 1993 (Revised 11 October 1993) Abstract A study of the transition from fission to deep-inelastic and quasi-elastic reactions in heavy ion collisions at intermediate energies is performed in the framework of a microscopic semi-classical one-body approach (Landau-Vlasov transport equation). A qualitative as well as quantitative study of phenomena occurring in this energy range is carried out and comparisons are made with experimental results focusing on the MO + MO reaction at 18.7 MeVfu. On the ground of dynamical info~ation given by the microscopic approach, an investigation of the sequential production of fragments is realized within a complemental analysis based on the macroscopic liquid-drop model approach. 1. Introduction Since accelerators of heavy ions at intermediate energy are available, experimental- ists have accumulated data proving the existence at these energies of a broad variety of processes like fusion, fission, evaporation, fragmentation, deep-inelastic regime, . .. . Theoretically, a great effort has been devoted to these complex dynamic processes during the last ten years introducing transport theories [ l-6] and specially the Vlasov equation supplemented by the introduction of a collision term taking into account the two-body residual interactions. Many theoretical studies based on these approaches exist for rather short time mechanisms such as formation of hot excited nuclei, flow, fragmentation, .. . . On the other hand, there is a lack of information on long time processes such as hot lis- sion due to computing time required to simulate this kind of phenomena and problems of numerical accuracy. However, first attempts to induce fission of an isolated nucleus have been done using momentum fields [ 7,8] or rotational fields [9]. In the present paper, a detailed study of a collision between two heavy ions is realized for several impact parameters. The purpose is to perform a theoretical investigation in the framework of the Landau-Vlasov equation to describe the complete or incomplete fusion of two incoming nuclei in relatively central collisions followed by the hot fission of the unstable formed system. More generally, we study the transition from fission to deep-inelastic regime and quasi-elastic reactions with increasing impact parameters. To 0375-9474/94/S 07.00 @ 1994 - EIsevier Science B.V. All rights reserved SSDI 0375-9474(93)E0690-A