Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
A 26.5: Vortrag
Donnerstag, 13. März 2025, 12:15–12:30, KlHS Mathe
Ab initio calculations of the hyperfine structure of fermium — •Joseph Andrews1,2, Jacek Bieron3, Per Jönsson4, Sebastian Reader1,2, and Michael Block1,2 — 1Helmholtz-Institut Mainz, Mainz, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 3Jagiellonian University, Kraków, Poland — 4Malmö University, Malmö, Sweden
Fermium (Z=100) is one of the two heaviest atoms for which experimental spectroscopic data exists, residing at the forefront of atomic and nuclear physics research. Over the past twenty years, it has been the subject of extensive theoretical and experimental investigation. Nuclear multipole moments are required to verify existing nuclear models, and one of the most accurate methods to determine nuclear dipole and quadrupole moments is to combine measured nuclear coupling constants with calculated deduced electric field gradients. Calculations were initially performed on its lighter homologue erbium where experimental results exist to determine the predictive accuracy of our model. Hyperfine interaction constants A and B of Er I and Fm I are investigated using the multiconfigurational Dirac-Hartree-Fock (MCDHF) method, involving over five million configuration state functions. Results of the ground state 5f12 7s2 (4f12 6s2) of both neutral atoms are presented and compared to previous calculations and experiments.
Keywords: Atomic Structure; Hyperfine; MCDHF; Theoretical Atomic Physics