Unexpected entrance-channel effect in the fission of 216Ra
- Chizhov, A. Y.
- Itkis, M. G.
- Itkis, I. M.
- Kniajeva, G. N.
- Kozulin, E. M.
- Kondratiev, N. A.
- Pokrovsky, I. V.
- Sagaidak, R. N.
- Voskressensky, V. M.
- Yeremin, A. V.
- L., Corradi
- A., Gadea
- A., Latina
- A. M., Stefanini
- S., Szilner
- M., Trotta
- A. M., Vinodkumar
- S., Beghini
- Montagnoli, Giovanna
- Scarlassara, Fernando
- Rusanov, A. Y. A.
- F., Hanappe
- O., Dorvaux
- N., Rowley
- L., Stuttge
Publication date
January 2003
DOI Publisher
American Physical Society (APS) ISSN
0556-2813Abstract
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
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