Nuclear Fission Dynamics: Past, Present, Needs, and Future
Abstract
Significant progress in the understanding of the fission process within a microscopic framework has been recently reported. Even though the complete description of this important nuclear reaction remains a computationally demanding task, recent developments in theoretical modeling and computational power have brought current microscopic simulations to the point where they can provide guidance and constraints to phenomenological models, without making recourse to parameters. An accurate treatment compatible with our understanding of the internucleon interactions should be able to describe the realtime dynamics of the fissioning system and could justify or rule out assumptions and approximations incompatible with the underlying universally accepted quantummechanical framework. Of particular importance are applications to observables that cannot be directly measured in experimental setups (such as the angular momentum distribution of the fission fragments, or the excitation energy sharing between the fission fragments, or fission of nuclei formed during the rprocess), and their dependence of the excitation energy in the fissioning system. Even if accurate predictions are not within reach, being able to extract the trends with increasing excitation energy is important in various applications. The most advanced microscopic simulations of the fission process do not support the widely used assumption of adiabaticity of the large amplitude collective motion in fission, in particular for trajectories from the outer saddle towards the scission configuration. Hence, the collective potential energy surface and inertia tensor, which are the essential elements of many simplified microscopic theoretical approaches, become irrelevant. In reality, the dynamics of the fissioning system is slower than in the case of pure adiabatic motion by a factor of three to four times and is strongly overdamped. The fission fragment properties are defined only after the full separation, while in most of the current approaches no full separation can be achieved, which increases the uncertainties in describing fissionrelated observables in such methods
 Publication:

Frontiers in Physics
 Pub Date:
 March 2020
 DOI:
 10.3389/fphy.2020.00063
 arXiv:
 arXiv:1912.00287
 Bibcode:
 2020FrP.....8...63B
 Keywords:

 Nuclear Fission;
 Density Functional Theory;
 collective motion;
 fission fragment properties;
 overdamped collective motion;
 adiabatic collective motion;
 average neutron multiplicity;
 Total excitation energy;
 Total kinetic energy;
 Nuclear Theory
 EPrint:
 14 pages, 7 figures,, published version