SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Invited Talks - II

HK 7.3: Hauptvortrag

Dienstag, 31. August 2021, 12:00–12:30, H1

Ab initio perspectives on strongly correlated nuclei — •Alexander Tichai — Institut für Kernphysik, Darmstadt, Germany

The description of nuclear many-body systems has witnessed tremendous progress in the last years due to the development of i) high-precision nuclear interaction models derived from chiral effective field theory and ii) the development of many-body expansion techniques building upon a suitably chosen A-body reference state [1]. The mild computational scaling of such expansion methods extends the reach of ab initio calculations that were previously limited by the capacity of large-scale diagonalization techniques. Nowadays, this allows for targeting up to one hundred interacting nucleons from first principles [2]. In this talk, I review the status of many-body expansion techniques applied to strongly correlated open-shell systems and discuss challenges that emerge for heavy nuclei well above the tin region.

For the description of open-shell nuclei symmetry-breaking techniques have been shown to provide a simple alternative to conceptually more involved multi-reference techniques [3]. Therefore, recent developments will be reviewed that build upon deformed mean-field states to capture the static correlations that emerge in nuclei away from shell closures. Finally, I provide an outlook on future perspectives for heavy nuclei that are out of reach of current ab initio technology [4].

[1] H. Hergert, Front. Phys. 8, 379 (2020) [2] T. Morris et al., Phys. Rev. Lett. 120, 152503 (2018) [3] A. Tichai et al., Phys. Lett. B, 786, 195 (2018) [4] A. Tichai et al., arXiv:2105.03935 (2021)