1. The fusion–fission and quasi-fission processes in the reaction 48Ca + 208Pb at energies near the Coulomb barrier
- Author
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I. V. Pokrovsky, G. N. Knyazheva, L. Krupa, Yu. Ts. Oganessian, E. M. Kozulin, V.V. Pashkevich, M. G. Itkis, I. M. Itkis, N. A. Kondratiev, A. A. Bogachev, E. V. Prokhorova, and A. Ya. Rusanov
- Subjects
Nuclear physics ,Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Spectrometer ,Fission ,Nuclear Theory ,Physics::Atomic and Molecular Clusters ,Coulomb barrier ,Fusion fission ,Atomic physics ,Nuclear Experiment ,Kinetic energy - Abstract
Mass-energy distributions (MEDs) and capture-fission cross sections have been measured in the reaction 48 Ca + 208 Pb → 256 No at the energies E lab = 206 – 242 MeV using a double-arm time-of-flight spectrometer CORSET. It has been observed that MED of the fragments consists of two parts, namely, the classical fusion–fission process corresponding to the symmetric fission of 256 No and quasi-fission “shoulders” corresponding to the light fragment masses ∼ 60 – 90 u and complimentary heavy fragment masses. The quasi-fission “shoulders” have a higher total kinetic energy (TKE) as compared with that expected for the classical fission. A mathematical formalism was employed for the MEDs fragment decomposition into fusion–fission and quasi-fission components. In the fusion–fission process a high-energy Super-Short mode has been discovered for the masses M H = 130 – 135 u and the TKE of ≈ 233 MeV .
- Published
- 2008