Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
A 30.7: Vortrag
Donnerstag, 14. März 2024, 16:00–16:15, HS 1098
Laser spectroscopy of Fermium-255 at the RISIKO mass separator facility — •Matou Stemmler for the Fermium collaboration — Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany
Laser spectroscopy can provide information about fundamental properties of both atomic and nuclear structure. Such measurements are of particular importance for the heaviest actinides and superheavy elements, where data is sparse. During the last measurement campaign at the RISIKO mass separator facility in the Institute of Physics at Johannes Gutenberg University Mainz (JGU), nine successive samples of the artificially produced ultra-rare isotope 255Fm (Z=100) of 108 to 109 atoms each, were used to study the atomic and nuclear structure of fermium. The samples originate from an initial 254Es sample that was produced at the Oak Ridge National Laboratory high flux nuclear reactor (USA). The sample was subsequently re-irradiated at the Institut Laue-Langevin reactor in Grenoble (F) with thermal neutrons to produce 255Es (half-life: 39.8 d), which decays to 255Fm (20.07 h) via β− decay. This presentation will focus on the atomic structure studies of 255Fm, for which a new three-step laser ionization scheme was developed. Rydberg convergences were studied and the accuracy of the ionization potential was improved [1].
[1] J. Am. Chem. Soc. 44, 14609-14613 (2018)
Keywords: Laser; Spectroscopy; Resonant Ionization; Fermium; Ionization Potential