Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster Session - Atomic Physics II
A 14.10: Poster
Dienstag, 10. März 2020, 16:00–18:00, Empore Lichthof
Resonance ionization spectroscopy on picogram amounts of 249−252Cf — •Felix Weber1, Nina Kneip1, Christoph E. Düllmann2,3,4, Vadim Gadelshin1, Christoph Mokry2,4, Sebastian Raeder3, Jörg Runke2,3, Petra Thörle-Pospiech2,4, Norbert Trautmann2, and Klaus Wendt1 — 1Insitute of Physics, JGU Mainz — 2Institute of Nuclear Chemistry, JGU Mainz — 3GSI Helmholtzzentrum, Darmstadt — 4Helmholtz Institute Mainz
Californium is an artificial actinide element. The isotopes 249−252Cf have half-lives 1 a; among these, the four heaviest ones can be produced by neutron-capture in high-flux reactors. Still only few optical spectroscopic studies have been performed on californium. Resonant laser ionization spectroscopy is an efficient technique to study atomic level schemes, and can be applied on samples containing 109 atoms or even less, and is also a powerful technique for ultra-trace determination. A sample containing about 5· 109 atoms of 249−252Cf were prepared on a zirconium backing. Widely tunable frequency doubled Ti:Sapphire lasers (350-490 nm) with an output power of up to 1 W were used to identify atomic levels applying efficient two step ionization schemes. For five different first excitation steps, autoionizing states were measured. Additionally, Rydberg series of californium were identified for the first time, converging to the ground and first excited state of the ion. Also the isotopic shift for one ground state transition was determined. In a next step high resolution spectroscopy to resolve the hyperfine splitting in odd Cf-isotopes will be addressed, e.g. to determine the so far unknown nuclear moment of 251Cf.