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Impact of ground-state correlations on the multipole response of nuclei: Ab initio calculations of moment operators

A. Porro1,2,*, A. Schwenk1,2,3,†, and A. Tichai1,2,3,‡

  • *Contact author: andrea.porro@tu-darmstadt.de
  • †Contact author: schwenk@physik.tu-darmstadt.de
  • ‡Contact author: alexander.tichai@tu-darmstadt.de
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Phys. Rev. C 112, 054303 – Published 5 November, 2025

DOI: https://doi.org/10.1103/1ktc-lknn

Abstract

We develop a framework that allows us 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 He4 to Ni78 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 O16 and Ca40, 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.

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Phys. Rev. C 112, 054303– Published 5 November, 2025
  • Received 28 July 2025
  • Accepted 23 September 2025
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