DOE OSTI · 3024320
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 Segrè 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. Here, 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 equationof-motion techniques— offer consistent descriptions of bulk properties across medium-mass isotopic chains.
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Marino, Francesco [Johannes Gutenberg-Universität Mainz (Germany)], Bonaiti, Francesca [Michigan State University, East Lansing, MI (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Demol, Pepijn [Université Libre de Bruxelles (Belgium); Brussels Laboratory of the Universe – BLU-ULB (Belgium); KU Leuven (Belgium)], Bacca, Sonia [Johannes Gutenberg-Universität Mainz (Germany)], Duguet, Thomas [Université Paris-Saclay, Gif-sur-Yvette (France); KU Leuven (Belgium)], Hagen, Gaute [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)], Jansen, Gustav R. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)], Papenbrock, Thomas [University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Tichai, Alexander [Technische Universität Darmstadt (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Max-Planck-Institut für Kernphysik, Heidelberg (Germany)]. 2026-03-10. From closed shells to open shells: Coupled-cluster calculations of atomic nuclei. https://doi.org/10.1103/p297-y8vq
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