Machine learning for correlations of electromagnetic properties in ab initio calculations

Year: 2025

Type: article

Abstract: In nuclear structure theory, accurately predicting electromagnetic observables, such as moments and transition rates, is essential for a comprehensive understanding of nuclear properties. However, computational limitations and conceptual difficulties often hinder the precise calculation of these observables. In this work, we extend machine learning methods for model-space extrapolations to electric quadrupole moments. We further present a new machine learning approach that leverages the correlations between energies, radii, and electromagnetic observables. By learning these correlations from no-core shell model calculations in accessible model spaces, this new model enables the prediction of electromagnetic observables in the full Hilbert space from predictions of full-space energies and radii, which can be obtained with established machine learning extrapolation tools. An essential property of our approach is the capability of uncertainty quantification, allowing for reliable predictions with combined statistical error estimates for many-body and interaction uncertainties. Being solely built upon the physical correlations of different observables, it can be generalized across different methods. We demonstrate the power of this new extrapolation scheme through a precision study of electric quadrupole moments across a wide range of p -shell nuclei.

Source: Physical Review C

DOI: 10.1103/frfs-xz86

Authors: Marco Knöll, Marc L. Agel, Tobias Wolfgruber, Pieter Maris, Robert Roth

Institutions: Technische Universität Darmstadt, Iowa State University

Language: English

Topic: Nuclear physics research studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: U.S. Department of Energy, National Energy Research Scientific Computing Center, Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung, Technische Universität Darmstadt, Office of Science, Argonne National Laboratory

OpenAlex ID: W4414039392