Impact of ground-state correlations on the multipole response of nuclei: Ab initio calculations of moment operators
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866914141848993792 |
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| author | Porro, Andrea Schwenk, Achim Tichai, Alexander |
| author_facet | Porro, Andrea Schwenk, Achim Tichai, Alexander |
| contents | We develop a framework that allows to calculate integrated properties of the nuclear response from first principles. Using the ab initio in-medium similarity renormalization group (IMSRG), we calculate the expectation values of moment operators that are linked to the multipole response of nuclei. This approach is applied to the isoscalar mono- and quadrupole as well as the isovector dipole response of closed-shell nuclei from $^4$He to $^{78}$Ni for different chiral two- and three-nucleon interactions. We find that the inclusion of many-body correlations in the nuclear ground state significantly impacts the multipole response when going from the random-phase approximation to the IMSRG level. Our IMSRG calculations lead to an improved description of experimental data in $^{16}$O and $^{40}$Ca, including a good reproduction of the Thomas-Reiche-Kuhn enhancement factor. These findings highlight the utility of the moment method as a benchmark for other ab initio approaches that describe nuclear response functions through the explicit treatment of excited states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20665 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Impact of ground-state correlations on the multipole response of nuclei: Ab initio calculations of moment operators Porro, Andrea Schwenk, Achim Tichai, Alexander Nuclear Theory We develop a framework that allows to calculate integrated properties of the nuclear response from first principles. Using the ab initio in-medium similarity renormalization group (IMSRG), we calculate the expectation values of moment operators that are linked to the multipole response of nuclei. This approach is applied to the isoscalar mono- and quadrupole as well as the isovector dipole response of closed-shell nuclei from $^4$He to $^{78}$Ni for different chiral two- and three-nucleon interactions. We find that the inclusion of many-body correlations in the nuclear ground state significantly impacts the multipole response when going from the random-phase approximation to the IMSRG level. Our IMSRG calculations lead to an improved description of experimental data in $^{16}$O and $^{40}$Ca, including a good reproduction of the Thomas-Reiche-Kuhn enhancement factor. These findings highlight the utility of the moment method as a benchmark for other ab initio approaches that describe nuclear response functions through the explicit treatment of excited states. |
| title | Impact of ground-state correlations on the multipole response of nuclei: Ab initio calculations of moment operators |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2507.20665 |