par Chizhov, Yu;Itkis, Mikhail;Itkis, I.M.;Kniajeva, G.N.;Kozulin, E.M.;Kondratiev, N.A.;Pokrovsky, I.V.;Sagaidak, Roman;Voskressensky, V.M.;Yeremin, Alexander;Corradi, Lorenzo;Gadea, Andrés;Latina, Andrea;Stefanini, A.M. A.M.;Szilner, Suzana;Trotta, Monica;Vinodkumar, A.M.;Beghini, Silvio;Montagnoli, G.;Scarlassara, Fernando;Rusanov, Ya;Hanappe, Francis 
;Dorvaux, O.;Rowley, Neil;Stuttge, Louise
Référence Physical review. C. Nuclear physics, 67, 1, page (116031-116035)
Publication Publié, 2003-01
;Dorvaux, O.;Rowley, Neil;Stuttge, LouiseRéférence Physical review. C. Nuclear physics, 67, 1, page (116031-116035)
Publication Publié, 2003-01
Article révisé par les pairs
| Résumé : | We have studied the mass and energy distributions of fission fragments from the two reactions 12C + 204Pb and 48Ca + 168Er that lead to the same compound nucleus 216Ra*. Despite the fact that the excitation energy was around 40 MeV in both cases, the contribution from asymmetric fission in the first reaction is only around 1.5% but is about 30% in the second. This marked increase in the yield of asymmetric products is connected to the quasifission process, in which important shell effects become evident. The mass-energy distributions are interpreted in terms of an independent decay mode competing with the normal fusion-fission process and possibly leading to a significant suppression of the fusion cross section itself. |
