Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 15: Poster – Highly Charged Ions and their Applications
A 15.3: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Hyperfine-induced transitions of nuclei and atoms — •Stephan Fritzsche1,2, Houke Huang1, Wu Wang3, and Yong Li3 — 1Helmholtz-Institut Jena, Germany — 2Friedrich-Schiller University Jena, Germany — 3Hainan University, Haikou 570228, China
The hyperfine interaction between nuclear moments and the electronic charge and current distributions is present in all atoms and ions with non-zero nuclear spin I. However, this interaction becomes visible only in transition probabilities, lifetimes and angular distribution of emitted photons, if the combined system "nucleus + electrons" supports additional multipole transitions, which are not accessible alone for the individual subsystems. Different communities have studied such "hyperfine phenomena" with varying notations and physical pictures in mind, including hyperfine transitions, the nuclear hyperfine effect or various kinds of (so-called) electron-bridge processes [1,2]. We here show how all these phenomena can readily be interpreted as special cases of hyperfine-induced nuclear and/or electronic multipole transitions.
[1] W. Wang, F. Zou, S. Fritzsche and Y. Li; Isomeric population transfer of the 229 Th nucleus via hyperfine electronic bridge; Phys. Rev. Lett. 133, 223001 (2024). [2] W. Wang, S. Fritzsche and Y. Li; Search for variations of the fine-structure constant via the hyperfine electronic bridge in highly charged 229Th ions; Phys. Rev. A112, 022811 (2025).
Keywords: hyperfine-induced; nuclear clock; nuclear hyperfine effect; electron-bridge process