1. Fusion Hindrance and Quasi-Fission in 48Ca Induced Reactions
- Author
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Trotta, Monica, Stefanini, A. M., Behera, B. R., Corradi, L., Fioretto, E., Gadea, A., Szilner, S., Wu, Y. W., Beghini, S., Montagnoli, G., Scarlassara, F., Chizhov, A. Yu., Itkis, I. M., Kniajeva, G. N., Kondratiev, N. A., Kozulin, E. M., Pokrovsky, I. V., Sagaidak, R. N., Voskressensky, V. M., Haas, F., and Rowley, N.
- Abstract
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.
- Published
- 2013
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