Two-body currents at finite momentum transfer and applications to electroweak processes with nuclei

par Catharina Brase (TU Darmstadt)

jeudi 27 nov. 2025, 14:00 → 15:00 Europe/Paris

100/2-A201 - Salle A201 (IJCLab)

Two-body currents (2BCs) are important for an accurate description of electroweak processes with nuclei. At zero momentum transfer, 2BCs and correlations were able to solve the longstanding quenching puzzle in $\beta$-decay. For other rare processes, 2BCs contribute at finite momentum transfer, e.g., for $0\nu\beta\beta$ decay and dark matter particles scattering off nuclei. In medium-mass or heavy nuclei, 2BCs at finite momentum transfer have so far only been included approximately. Recently, this was overcome by developing multipole-decomposed 2BCs at finite momentum transfer. In this talk, we explore the impact of 2BCs at finite momentum transfer with a focus on magnetic dipole properties around $^{48}$Ca and for nuclear response functions needed for dark matter direct detection using the ab initio valence-space in-medium similarity renormalization group (VS-IMSRG).

2025_Orsay_Seminar_Brase.pdf