Benchmark of the GEF model for fission-fragment yields over an enlarged range

TL;DR

This paper evaluates the GEF model's performance in predicting fission fragment yields across a broader range of nuclear systems and observables, emphasizing recent experimental data and model limitations.

Contribution

It extends the benchmarking of the GEF model to new regions of fissioning systems and observables, providing insights into its accuracy and areas for improvement.

Findings

High agreement with recent experimental data

Identification of specific model discrepancies

Emphasis on the importance of experimental resolution

Abstract

The GEneral description of Fission observables (GEF) model was developed to produce fission related nuclear data which are of crucial importance for basic and applied nuclear physics. The investigation of the performance of the GEF code is here extended to a region in fissioning-system mass, charge, excitation energy and angular momentum, as well as to new observables, that could not be benchmarked in detail so far. The work focuses on fragment mass and isotopic distributions, benefiting from recent innovative measurements. The approach reveals a high degree of consistency and provides a very reasonable description of the new data. The physics behind specific discrepancies is discussed, and hints to improve on are given. Comparison of the calculation with experiment permits to highlight the influence of the system intrinsic properties, their interplay, and the importance of experimental aspects, namely instrumental resolution. All together points to the necessity of as selective and accurate as possible experimental data, for proper unfolding of the different influences and robust interpretation of the measurement. The GEF code has become a widely used tool for this purpose