par Péter, Jean;Ngô, Christian;Plasil, Franz;Tamain, Bernard;Berlanger, Michel 
;Hanappe, Francis
Référence Nuclear physics. A, 279, 1, page (110-124)
Publication Publié, 1977-03
;Hanappe, Francis Référence Nuclear physics. A, 279, 1, page (110-124)
Publication Publié, 1977-03
Article révisé par les pairs
| Résumé : | The interaction of 63Cu ions with 197Au nuclei have been studied experimentally at incident energies of 365 and 443 MeV (1.1 and 1.4 times the Coulomb barrier). Mass and kinetic energy distributions of reaction products have been measured at several angles. Near the grazing angle, a continuous transition was found from elastic events to partially damped (PD) events, and to fully damped events (quasi-fission, QF). Away from the grazing angle a clean separation between elastic and QF events was observed. Events that may be due to fission following fusion (CF) were also obtained. Results are discussed in terms of decomposition into PD, QF, and CF components. The QF kinetic energy is independent of the incident energy (implying full damping of the initial relative motion). It is lower than the Coulomb barrier and close to the kinetic energies from the fission of similar systems. The angular distribution is peaked somewhat forward of the grazing angle for low mass transfers. For large mass transfers the yield increases slowly with decreasing angle. At 443 MeV a large contribution from negative angles is present. σQF accounts for more than 65 % of the reaction cross section σR at 443 MeV and for more than 50 % at 365 MeV. The upper limit on CF is about 10 % of σR, and σPDis of the order of 25 % of σR. © 1977. |
