par Gerschel, Claudie;Deleplanque, M.A. M.A.;Ishihara, Masayasu;Ngô, Christian;Perrin, Nathalie;Péter, Jean;Tamain, Bernard;Valentin, Luc;Paya, D.;Sugiyama, Yasuharu;Berlanger, Michel 
;Hanappe, Francis
Référence Nuclear physics. A, 317, 2-3, page (473-494)
Publication Publié, 1979-04
;Hanappe, Francis Référence Nuclear physics. A, 317, 2-3, page (473-494)
Publication Publié, 1979-04
Article révisé par les pairs
| Résumé : | This paper concerns γ-ray multiplicity experiments performed on three systems: Ar+Au at 227 MeV, Cu+Au at 365 and 443 MeV. The Ar+Au system has been chosen because both quasifission and fission following complete fusion processes can be distinguished. Moreover, the angular momentum window associated with quasi-fission is narrow. Inversely, in the Cu + Au case most of the cross section corresponds to quasi-fission. The absolute multiplicity values measured are used to test whether or not the rolling or the sticking stages are reached. It is found that the answer depends on the system, the fragment detection angle and the incoming beam energy. Comparisons with the predictions of various models are presented. No model explains all the results. The influence of mass and kinetic energy transfers on the multiplicity values are widely discussed. Finally, it is shown that it is impossible to explain all the data without assuming that some collective modes induced during the process are responsible for some additional angular momentum observed in the fragments. © 1979. |
