SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Structure and Dynamics of Nuclei XIV
HK 69.3: Vortrag
Donnerstag, 23. März 2023, 16:15–16:30, SCH/A118
Neutrinoless double-β decay in an effective field theory — •Catharina Brase1,2,3, Javier Menéndez4,5, and Achim Schwenk1,2,3 — 1Technische Universität Darmstadt, Department of Physics — 2Max-Planck-Institut für Kernphysik, Heidelberg — 3ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 4Departament de Física Quántica i Astrofísica, Universitat de Barcelona, 08028 Barcelona, Spain — 5Institut de Ciències del Cosmos, Universitat de Barcelona, 08028 Barcelona, Spain
We study neutrinoless double-β decay in an effective field theory (EFT) for heavy nuclei, which are treated as a spherical core coupled to additional neutrons and/or protons. The low-energy constants for this unobserved decay are constrained through a correlation with double Gamow-Teller transitions. This correlation was recently found to hold for shell-model calculations, energy-density functionals, and other nuclear structure models. We therefore first calculate the nuclear matrix elements for double Gamow-Teller transitions in the EFT for heavy nuclei. The combination of the EFT uncertainty with the correlation uncertainty enables predictions of nuclear matrix elements for neutrinoless double-β decay for a broad range of isotopes with quantified uncertainties. Generally the EFT predicts smaller nuclear matrix elements compared to other approaches, but our EFT results are consistent with recent ab initio calculations.
* Funded by the ERC Grant Agreement No. 101020842 and by the DFG – Project-ID 279384907 – SFB 1245.