Fusion hindrance and quasi-fission in ^48Ca induced reactions (CROSBI ID 107582)
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Podaci o odgovornosti
Trotta, M. ; Stefanini, A.M. ; Behera, B.R. ; Corradi, L. ; Fioretto, E. ; Gadea, A. ; Szilner, Suzana ; Wu, Y.W. ; Beghini, S. ; Montagnoli, G. ; Scarlassara, F. ; Chizhov, A.Y. ; Itkis, I.M. ; Kniajeva, G.N. ; Kondratiev, N.A. ; Kozulin, E.M. ; Pokrovsky, I.V. ; Sagaidak, R.N. ; Voskressensky, V.M. ; Haas, F. ; Rowley, N.
engleski
Fusion hindrance and quasi-fission in ^48Ca induced reactions
Fusion-fission and fusion-evaporation cross sections have been measured in a large energy range for the ^48Ca+^168Er, ^154Sm reactions. The comparison of the reduced evaporation data for such reactions and for collisions induced by light projectiles leading to the same compound nuclei ^216Ra* and ^202Pb* puts in evidence a fusion hindrance, which is particularly large for the first composite system. This fusion suppression is consistent with a noticeable contribution coming from quasi-fission events observed in the mass-energy distribution of fission fragments. The asymmetric shape of the quasi-fission component has been explained in terms of shell effects in the exit channel, favouring the population of closed shell fission fragments. The comparison of ^48Ca+^154Sm with preliminary data on ^48Ca+^144Sm seems to suggest that the target deformation plays a role in the onset of the quasi-fission mechanism.
heavy-ion reactions; evaporation residues; compound nuclei; fusion; quasi-fission
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