Conveners
Nuclear fission
- Luis Robledo
Nuclear fission
- Luis Robledo
Recently, new measurements of the fission fragments’ spin showed no correlations between the fragments’ spin. These results have stimulated extensive theoretical discussion about the generation, orientation, and correlation of the fission fragments spin. In this contribution, I will discuss several approaches microscopical and collective to describe the mechanisms responsible for the angular...
First of all, we will present new methods using constraints on overlaps and leading to continuous and regular, adiabatic and excited 1D PES, within the framework of constrained HFB theory. Next, we'll present some of the results that these new PES allow us to study, first at the static level, then by performing dynamics including intrinsic excitations using the SCIM formalism. Results include...
The scission configuration is intuitively defined in the moment of the fission process when the mother nucleus breaks into two nascent fragments. In the continuous fission process, this configuration may be defined in various ways depending on the applied model. Nevertheless, as many observables are fixed at this point, the definition is important for properly reproducing the experimental...
In 2016, the first simulation of a compound nucleus’ evolution from the outer saddle point to scission, which is the most rapid and highly non-equilibrium stage of fission, to two fully separated fission fragments (FFs) was achieved for realistic initial conditions. This was done in the framework of the time-dependent superfluid local density approximation (TDSLDA) or equivalently...
Usually fission is described in terms of the evolution of the nuclear shape from the ground state of the nucleus up to the pre-scission configuration. In the microscopic picture, the energy dependence of shape evolution can be studied within the Hartree- Fock-Bogoliubov (HFB) mean field theory. To do so, one needs to arbitrary choose constraints on deformation parameters, associated (most...
One of the most challenging problems in nuclear physics is to describe nuclear fission microscopically starting from nucleonic degrees of freedom. Such microscopic description is important particularly for low-energy induced fission, in which the excitation energy of the compound nucleus is relatively low so that an application of the statistical model may be questionable. This includes...
The task of modelling the dynamics of a fissioning nucleus in order to extract observable quantities with sufficient accuracy to verify and predict experimental outcomes is an ongoing challenge. One category of solutions to this problem is based on a "beyond mean-field" approach utilising the time-dependent generator coordinate method (TDGCM), which simulates the dynamics of a fissioning...
In recent years, the study of angular momentum in fission fragments has undergone a renaissance. Both theoretical and experimental advancements have reignited the long-standing debate on several unresolved questions, including the generation mechanism of angular momentum in fragments, its mass dependence, and correlations between fragments. One open question is how to use microscopic theory to...
