Erlangen 2022 – scientific programme
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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: Talk
Wednesday, March 16, 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. Düllmann1,2,3, Christian M. Marquardt4, Christoph Mokry1,2, Petra J. Panak4, Sebastian Raeder2,3, Jörg Runke1,3, 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 5f76d7s2 9D2o. 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.