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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Structure and Dynamics of Nuclei VIII
HK 28.4: Gruppenbericht
Mittwoch, 12. März 2025, 16:45–17:15, HS 2 Physik
Two-body currents at finite momentum transfer and M1 transitions — •Catharina Brase1,2,3, Takayuki Miyagi1,2,3,4, Kai Hebeler1,2,3, Javier Menéndez5,6, and Achim Schwenk1,2,3 — 1Technische Universität Darmstadt, Department of Physics — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg — 4Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8577, Japan — 5Departament de Física Quántica i Astrofísica, Universitat de Barcelona, 08028 Barcelona, Spain — 6Institut de Ciències del Cosmos, Universitat de Barcelona, 08028 Barcelona, Spain
We derived a multipole decomposition of two-body currents (2BCs) to include 2BCs at finite momentum transfer in the calculation for processes with medium-mass nuclei, without approximating the 2BCs. We investigate the effects of 2BCs on the most dominant M1 transition at 10.23 MeV in 48Ca using the valence-space in-medium similarity renormalization group with a set of non-implausible interactions. Experiments, such as (e,e′) and (γ , n), disagree on the magnetic dipole transition strength B(M1) of this transition. We find that our results favor larger B(M1) values in agreement with recent coupled-cluster calculations. For validation of our results, we investigate additional observables in 48Ca and M1 transitions in 48Ti. Our predictions agree with these observables.
* Funded by the ERC Grant Agreement No. 101020842.
Keywords: Two-body currents at finite momentum transfer; VS-IMSRG; magnetic dipole transition; set of non-implausible interactions; 48Ca and 48Ti