Semi-microscopical description of the scission configuration in the neutronless fission of 252Cf
S. Misicu1 - Ph. Quentin2
1 National Institute for Physics and Nuclear Engineering, Bucharest-Magurele, P.O.B. MG-6,
2 Centre d'Etudes Nucléaires de Bordeaux-Gradignan, Université Bordeaux I and IN2P3/CNRS, France
Received: 24 September 1999 Communicated by B. Povh
The neutronless fission of 252Cf is studied in the frame of a molecular model in which the scission configuration is described by two aligned fragments interacting by means of Coulomb (+ nuclear) forces. The study is carried out for different distances between the fragments tips and excitation energies. For a given deformation, the fragment's total energy is computed via the constrained Hartree-Fock + BCS formalism. The total excitation energy present in the fragments is supposed to contribute only to the fragments deformation and the asymptotic value of the kinetic energy is equated to the inter-fragment potential at scission. These two constraints are yielding a few fission channels for a fixed tip distance and excitation energy. Discarding those fission channels corresponding to a disequilibrium in the sharing of the excitation energy between the two fragments, we establish the most likely scission configurations for a specified excitation energy.
21.60 Gx Cluster models - 21.60.Jz Hartree-Fock and random-phase approximations - 24.75.+i General properties of fission - 25.85.Ca Spontaneous fission