Structure and dynamics of open-shell nuclei from spherical coupled-cluster theory
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908814704377856 |
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| author | Marino, Francesco Bonaiti, Francesca Bacca, Sonia Hagen, Gaute Jansen, Gustav R. |
| author_facet | Marino, Francesco Bonaiti, Francesca Bacca, Sonia Hagen, Gaute Jansen, Gustav R. |
| contents | We extend the spherical coupled-cluster ab initio method for open-shell nuclei where two nucleons are removed from a shell subclosure. Following the recent implementation of the two-particle attached approach [Phys. Rev.C 110 (2024) 4, 044306], we focus on the two-particle-removed method. Using the equations-of-motion framework, we address both nuclear structure and dipole response functions by coupling coupled-cluster theory with the Lorentz integral transform technique. We perform calculations using chiral interactions, including three-nucleon forces, and estimate many-body uncertainties by comparing different coupled-cluster truncation schemes. We validate our approach by studying ground-state energies, excited states, and electric dipole polarizabilities in the oxygen and calcium isotopic chains. For binding energies and selected low-lying excited states, we achieve an accuracy comparable to that of the established closed-shell coupled-cluster theory and generally agree with experiment. Finally, we underestimate experimental data for electric dipole polarizabilities, particularly in calcium isotopes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_11012 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Structure and dynamics of open-shell nuclei from spherical coupled-cluster theory Marino, Francesco Bonaiti, Francesca Bacca, Sonia Hagen, Gaute Jansen, Gustav R. Nuclear Theory Nuclear Experiment We extend the spherical coupled-cluster ab initio method for open-shell nuclei where two nucleons are removed from a shell subclosure. Following the recent implementation of the two-particle attached approach [Phys. Rev.C 110 (2024) 4, 044306], we focus on the two-particle-removed method. Using the equations-of-motion framework, we address both nuclear structure and dipole response functions by coupling coupled-cluster theory with the Lorentz integral transform technique. We perform calculations using chiral interactions, including three-nucleon forces, and estimate many-body uncertainties by comparing different coupled-cluster truncation schemes. We validate our approach by studying ground-state energies, excited states, and electric dipole polarizabilities in the oxygen and calcium isotopic chains. For binding energies and selected low-lying excited states, we achieve an accuracy comparable to that of the established closed-shell coupled-cluster theory and generally agree with experiment. Finally, we underestimate experimental data for electric dipole polarizabilities, particularly in calcium isotopes. |
| title | Structure and dynamics of open-shell nuclei from spherical coupled-cluster theory |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2504.11012 |