From closed shells to open shells: Coupled-cluster calculations of atomic nuclei
Abstract
Coupled-cluster theory is a powerful tool for first-principles calculations of atomic nuclei, enabling accurate predictions of nuclear observables across the Segr\`e chart. While coupled-cluster computations are especially efficient at shell closures, extensions have been developed to tackle open-shell nuclei, by exploiting the equation-of-motion method or by expanding the coupled-cluster wave function on top of a symmetry-breaking (either deformed or superfluid) reference state. In this study, we provide a comprehensive comparison of these different formulations applied to the calcium and nickel isotopes using nuclear two- and three-body interactions from chiral effective field theory. Based on ground-state energies, two-neutron separation energies, and two-neutron shell gaps, different coupled-cluster computations - based on symmetry-broken reference states and equation-of-motion techniques - offer consistent descriptions of bulk properties across medium-mass isotopic chains.
Keywords
Cite
@article{arxiv.2512.17311,
title = {From closed shells to open shells: Coupled-cluster calculations of atomic nuclei},
author = {F. Marino and F. Bonaiti and P. Demol and S. Bacca and T. Duguet and G. Hagen and G. R. Jansen and T. Papenbrock and A. Tichai},
journal= {arXiv preprint arXiv:2512.17311},
year = {2026}
}