par Zheng, Z.;Borderie, Bernard;Gardès, Daniel;Gauvin, Henri;Hanappe, Francis 
;Péter, Jean;Rivet, M.F.;Tamain, Bernard;Zaric, A.
Référence Nuclear physics. A, 422, 2, page (447-460)
Publication Publié, 1984-06
;Péter, Jean;Rivet, M.F.;Tamain, Bernard;Zaric, A.Référence Nuclear physics. A, 422, 2, page (447-460)
Publication Publié, 1984-06
Article révisé par les pairs
| Résumé : | Fusion-fission products have been studied for three reactions: Ar + Au, Ar + Bi and Ar + U (5.25-7.5 MeV/u). By measuring symmetric fragmentation components (fission-like events), cross sections for fusion were deduced and compared with the predictions of static and dynamic models. With increasing projectile energy, the width of the mass distributions strongly increases for the two lighter systems. By contrast, for Ar + U it remains essentially constant at a very large value. These results clearly demonstrate that the large increase of the width of the mass distribution cannot be attributed simply to large values of the angular momentum. However, they can be explained by the occurence of a different dissipative process, fast fission, which can be expected if there is no barrier to fission. For the reaction Ar + Au, the total kinetic-energy distributions were also studied in detail. In this case fast fission occurs only at high incident energy. The average total kinetic energy (TKE) was found to be constant with increasing energy whereas the widths of the TKE distribution increase. © 1984. |
