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Q: Fachverband Quantenoptik und Photonik

Q 39: Precision spectroscopy of atoms and ions II (joint session A/Q)

Q 39.1: Vortrag

Mittwoch, 16. März 2022, 14:00–14:15, A-H2

Ionization potential, atomic and nuclear structure of ^244−248Cm by laser spectroscopy — Nina Kneip¹, Felix Weber¹, Magdalena A. Kaja¹, Christoph E. Düllmann^1,2,3, Christian M. Marquardt⁴, Christoph Mokry^1,2, Petra J. Panak⁴, Sebastian Raeder^2,3, Jörg Runke^1,3, Dominik Studer¹, Petra Thörle-Pospiech¹, Norbert Trautmann¹, and •Klaus Wendt¹ — ¹Johannes Gutenberg University, 55099 Mainz — ²Helmholtz Institute, 55099, Mainz — ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — ⁴Karlsruhe Institute of Technology, 76131 Karlsruhe

Curium (Z=96) is located in the middle of the actinide series and has a half-filled atomic f shell with a ground state configuration 5f⁷6d7s^{2 9}D₂^o. One ton of spent nuclear fuel, contains up to 20 g of ²⁴⁸Cm, generated by multiple neutron capture of ²³⁸U. This environmental aspect in combination with its long half-life of 328 Ma motivates fundamental laser spectroscopic studies on the actinide. Resonance ionization spectroscopy was applied to study the atomic and nuclear structure of the isotopes, ^244−248Cm was spectroscopically investigated. Three different ground state transitions were used as first excitation steps. Scanning the laser around the expected value of the ionization potential (IP), numerous Rydberg levels and auto-ionizing levels were located. The IP was re-determined using field ionization and Rydberg convergence techniques for comparison. The hyperfine structure of ²⁴⁵Cm and ²⁴⁷Cm and the isotopic shift in the isotope chain ^244−248Cm were measured for the first time by laser spectroscopy.