Regular Article - Experimental Physics
Consistent theoretical model for the description of the neutron-rich fission product yields
Department of Physics, University of Jyväskylä, POB 35, 40351, Jyväskylä, Finland
2 V.G. Khlopin Radium Institute, 194021, St.-Petersburg, Russia
Accepted: 2 February 2012
Published online: 18 April 2012
The consistent model for the description of the independent fission product formation cross-section at light projectile energies up to about 100MeV is described. Pre-compound nucleon emission is described in the framework of the two-component exciton model using the Monte Carlo method, which allows one to incorporate a time duration criterion for the pre-equilibrium stage of the reaction. The decay of the excited compound nuclei, formed after the pre-equilibrium neutron and proton emission, is treated within the time-dependent statistical model with the inclusion of the main dynamical effects of nuclear friction on the fission width and saddle-to-scission descent time. For each member of the compound nucleus ensemble at scission point, the primary fragment isobaric chain yields are calculated using the multimodal approach with the inclusion two superasymmetric fission modes. The charge distribution of the primary fragment isobaric chains was considered as a results of frozen quantal fluctuations of the isovector nuclear matter density at the finite scission neck radius. The calculated fission product formation cross-sections in the neutron, proton, and -rays induced fission of the heavy actinides are presented.
© SIF, Springer-Verlag Berlin Heidelberg, 2012