SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 26: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 26.7: Talk
Thursday, March 9, 2023, 16:15–16:30, F303
High-resolution laser spectroscopy on the isotopes 244−248Cm — •Nina Kneip1, Felix Weber2, Christoph E. Düllmann2,3,4, Christian M. Marquardt5, Christoph Mokry2,3, Petra J. Panak5, Sebastian Raeder3,4, Jörg Runke2,4, Dominik Studer3, Clemens Walther1, and Klaus Wendt2 — 1Leibniz University Hannover, 30060 Hannover — 2Johannes Gutenberg University Mainz, 55099 Mainz — 3Helmholtz Institute Mainz, 55099 Mainz — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt — 5Karlsruhe Institute of Technology, 76131 Karlsruhe
The transuranium element curium (Z=96) is one of the minor actinides present in spent nuclear fuel. It is produced during power reactor operation in a series of nuclear reactions from 238U. The resonance ionization mass spectroscopy (RIMS) method was used at the RISIKO mass separator at Mainz University for off-line studies in the complex, highly dense atomic structure of Cm. Due to its high ionization efficiency and outstanding elemental selectivity, RIMS is an excellent tool for high-precision laser spectroscopy on these minuscule samples. The isotope shift was measured for the isotope chain 244−248Cm for two different energy levels with the electron configurations 5f76d7s7p 9D3 and 5f86d7s 9D3. The odd-A iostopes were present with only 1011−1012 atoms. A narrow band Ti:sapphire laser system was used for high-precision measurements specifically to resolve the hyperfine structures of 245,247Cm with 15 hyperfine transitions each. Finally, the modified King plot was used to determine the missing mean square charge radius of 247Cm.