Neutron-Alpha Reaction Cross Section Determination by Machine Learning Approaches

This study focuses on leveraging powerful machine learning approaches to determine neutron- alpha reaction cross-sections within the 14-15 MeV energy range. The investigation utilizes an experimental dataset comprising measurements of 133 nuclei concerning (n, alpha) reaction cross- sections. These data are divided into training and validation subsets, following established protocols, with 80% allocated for model training and 20% for testing. Key nucleus characteristics, including neutron number (N), mass number (A), and symmetry representation [(N-Z)(2)/A], were used as input variables for the machine learning models. SVR and XGBoost methods showed superior performance among the other machine learning methods used in the present study. In addition, a machine learning based online calculation tool was developed to estimate the reaction cross section.