Electroweak Currents in Deformed Nuclei: From M1 Transitions to Weak ProcessesHYBRID

Electroweak currents describe the interaction between external probes — such as photons, muons, and neutrinos — and the nucleus via the underlying vector and axial-vector operators. Recent studies have shown that higher-order many-body effects, in particular two-body electroweak currents derived from chiral effective field theory, can give non-negligible contributions and are therefore essential for an accurate description of nuclear observables.

In this talk, I will discuss the role of such two-body currents in deformed nuclei within a nuclear density functional theory framework. I consider magnetic dipole (M1) moments in open-shell, deformed systems. I will outline how the M1 operator is constructed, how two-body currents are consistently implemented, and how their contributions modify magnetic moments compared to standard one-body calculations. Building on this, I will then present ongoing work towards a unified treatment of Q-dependent electroweak currents for weak processes at finite momentum transfer. I will briefly summarize the structure of the vector and axial-vector operators beyond the long-wavelength limit, highlight the status of benchmarking the corresponding one-body and two-body matrix elements, and sketch perspectives for applications to electroweak response in deformed nuclei, including processes such as muon capture and neutrino–nucleus scattering.