Présidents de session
Calculations, Models for Fission Data
- David Regnier (CEA, DAM, DIF)
Modeling fission properties, such as barriers and rates, is highly challenging. The most advanced methods, based on energy density functionals (EDFs), rely on a limited set of collective coordinates to describe the evolution of a fissioning nucleus from its ground state to scission. Commonly used degrees of freedom include the quadrupole moment, which describes axially symmetric ellipsoids,...
There is a large variety of models to describe the fission process, from phenomenological to microscopical, with eventually a time dependence. The SPY model takes advantage of the microscopic description of the static properties of the nucleus (energy, nucleon distribution, and state density), based on the HFB method, and the simplicity of the statistical description of the fission process at...
Modern nuclear theory provides insights into the mechanisms of nuclear fission and increasingly allows quantitative predictions. Many observables of interest are determined by the properties of primary fission fragments, whose subsequent decay is typically modeled using statistical reaction theories. A primary goal of fission theory is therefore to provide microscopic predictions of these...
The intrinsic spin of fission fragments is closely connected to their strong deformation at scission, yet its microscopic origin remains unclear within density functional theory. Although angular momentum projection techniques reproduce spin distributions qualitatively, the role played by deformation-driven angular fluctuations has not been clearly identified. In this contribution, fission...
