Ab initio calculations of monopole sum rules: From finite nuclei to infinite nuclear matter
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911474303107072 |
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| author | Bonaiti, Francesca Porro, Andrea Bacca, Sonia Schwenk, Achim Tichai, Alexander |
| author_facet | Bonaiti, Francesca Porro, Andrea Bacca, Sonia Schwenk, Achim Tichai, Alexander |
| contents | We compute moments of the isoscalar monopole response of N = Z closed-shell nuclei based on chiral nucleon-nucleon plus three-nucleon interactions. We employ the random phase approximation (RPA) and two ab initio many-body approaches, the in-medium similarity renormalization group (IMSRG) and coupled-cluster theory (CC). In the IMSRG framework, the moments are obtained as ground-state expectation values, whereas in the CC approach, they are evaluated through excited-state calculations. We find good agreement between the IMSRG and CC results across all nuclei studied. RPA provides a reasonable approximation to the correlated methods if the interaction is soft. From the calculated moments, we extract average energies of the monopole response, compute finite-nucleus incompressibilities, and estimate the incompressibility of symmetric nuclear matter by a fit to a leptodermous expansion. Our extrapolated values are lower than those obtained in nuclear matter calculations with the same interactions, but the values are consistent with phenomenological ranges. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_15836 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ab initio calculations of monopole sum rules: From finite nuclei to infinite nuclear matter Bonaiti, Francesca Porro, Andrea Bacca, Sonia Schwenk, Achim Tichai, Alexander Nuclear Theory Nuclear Experiment We compute moments of the isoscalar monopole response of N = Z closed-shell nuclei based on chiral nucleon-nucleon plus three-nucleon interactions. We employ the random phase approximation (RPA) and two ab initio many-body approaches, the in-medium similarity renormalization group (IMSRG) and coupled-cluster theory (CC). In the IMSRG framework, the moments are obtained as ground-state expectation values, whereas in the CC approach, they are evaluated through excited-state calculations. We find good agreement between the IMSRG and CC results across all nuclei studied. RPA provides a reasonable approximation to the correlated methods if the interaction is soft. From the calculated moments, we extract average energies of the monopole response, compute finite-nucleus incompressibilities, and estimate the incompressibility of symmetric nuclear matter by a fit to a leptodermous expansion. Our extrapolated values are lower than those obtained in nuclear matter calculations with the same interactions, but the values are consistent with phenomenological ranges. |
| title | Ab initio calculations of monopole sum rules: From finite nuclei to infinite nuclear matter |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2511.15836 |