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A: Fachverband Atomphysik
A 15: Poster – Highly Charged Ions and their Applications
A 15.1: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG
Efficient production of 229mTh via Cascade Decay — •Yumiao Wang1,2 and Changbo Fu1 — 1Fudan University, Shanghai, China — 2Johannes Gutenberg Universität Mainz, Germany
The low-energy nuclear isomeric state of 229mTh (8.36 eV) provides a unique bridge between nuclear and atomic physics, with promising applications in nuclear clocks and precision metrology. However, its efficient and controllable population remains a long-standing experimental challenge.
An indirect excitation scheme based on nuclear cascade decay in an electron beam ion trap (EBIT) and a storage ring (SR) is formulated for highly charged 229Th ions, for which the strengthened electron–nucleus interaction leads to enhanced excitation cross sections. In this scheme, 229Th nuclei are first excited to higher-lying nuclear states via electron-induced processes, namely nuclear excitation by inelastic electron scattering (NEIES) and nuclear excitation by electron capture (NEEC). The corresponding excitation cross sections are calculated within the Dirac-Hartree-Fock-Slater framework.
This study establishes a unified theoretical scheme linking electron-induced nuclear excitation and cascade nuclear relaxation in EBIT and SR environments, providing a realistic pathway toward the efficient and controllable production of 229mTh.
This work is supported by the National Natural Science Foundation of China (NSFC) under Grant No. 12235003 and the China Scholarship Council (CSC).
Keywords: Th isomers; Cascade Decay; Highly charged ions; Efficient production; NEEC/NEIES