SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
A 33.4: Vortrag
Freitag, 10. März 2023, 15:15–15:30, B302
Nuclear moments and isotope shifts of 249−253Cf probed by laser spectroscopy — •Dominik Studer for the Cf collaboration — Institut für Physik, JGU Mainz — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — Helmholtz-Institut Mainz
Obtaining a comprehensive picture of nuclear phenomena in heavy nuclei requires precise measurements of, e.g., spins, electromagnetic moments and charge radii. These provide important data to pin down shell closures and to reveal their effect on observables, and serve as benchmarks for theory. However, experiments at the heavy-element frontier are challenging due to of limited sample sizes or production yields, and scarcity of atomic structure information. In this contribution we report on high-resolution laser spectroscopy of 249−253Cf across the N=152 shell closure. A sample containing 249−252Cf was produced in the HFIR reactor at Oak Ridge National Laboratory, USA. Part of this sample was later re-irradiated at the high-flux reactor at ILL to obtain ≈20 fg of 253Cf. The spectroscopic measurements were carried out at the RISIKO mass separator in Mainz. Spectrocopy with the laser perpendicular to the atomic beam using the PI-LIST ion source proved to be feasible with sample sizes on the femtogram level. Isotope shifts and hyperfine structures were measured for three ground-state transitions with linewidths in the order of 100 MHz, allowing the determination of the nuclear magnetic dipole moments of 249Cf, 251Cf and 253Cf. The spectroscopic measurements are presented and the results are compared to state-of-the-art theoretical calculations.