Recently, a large set of experimental data on angular momenta of fission fragments has been obtained. This includes absence of correlations between angular momenta of fission fragments, weak dependence of angular momentum on total kinetic energy, and, finally, the saw-tooth behavior of fragment's angular momentum on its mass. To investigate these phenomena, we propose a model describing the evolution of the fissioning nucleus toward scission. The model assumes that, after tunneling through the fission barrier, the nucleus can be represented by a superposition of dinuclear systems (DNS). The angular motion in the DNS is treated quantum-mechanically, yielding the angular momentum distribution of DNS nuclei at scission configurations. We calculate main fission observables, including mass, TKE, and neutron multiplicity distributions. The correlations between these observables and angular momenta of fission fragments have been analyzed and explained.

Inviter: Shan-Gui Zhou