Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 17: Poster III

A 17.13: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent C

Ab initio MCDHF calculations of transition rates and energy levels of Lr I — •Joseph Andrews¹, Jon Grumer², Per Jönsson³, Jacek Bieroń⁴, and Stephan Fritzsche^1,5,6 — ¹Friedrich-Schiller-Universität, Jena, Germany — ²Uppsala universitet, Uppsala, Sweden — ³Malmö universitet, Malmö, Sweden — ⁴Uniwersytet Jagielloński, Krakow, Poland — ⁵Helmholtz-Institut, Jena, Germany — ⁶GSI, Darmstadt, Germany

Lawrencium (Z=103), is the heaviest actinide and heaviest element prior to the superheavy region, residing at the forefront of atomic and nuclear physics research. However few experimental results exist for it and theoretical results differ from each other [Phys. Rev. A 104, 052810 (2021), Eur. Phys. J. D 45, 107 (2007)]. To assist their search, experimentalists require precise calculations of transitions with a high Einstein coefficient A. Calculations were initially performed on its lighter homologue Lutetium where experimental results exist to determine the predictive accuracy of our model. Energy levels, transition rates and Landé g-factors of Lr I and Lu I are investigated using the multiconfigurational Dirac-Hartree-Fock (MCDHF) method. Results of both neutral atoms are presented and compared to previous calculations and experiments. Previous calculations of Lr with MCDHF may be considered unreliable due to the small number of correlation orbitals being used, thus it is unclear whether convergence was reached. We report more reliable values than previous MCDHF calculations of the energy levels and Landé g-factors of the 7s² 8s  ¹S₀ , 7s² 7p   ² P_{1/2, 3/2}, 7s² 7d   ² D_{3/2, 5/2} levels and the corresponding transition rates.