SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Structure and Dynamics of Nuclei VI
HK 32.1: Vortrag
Mittwoch, 22. März 2023, 14:00–14:15, SCH/A215
Probing the N=152 neutron shell closure by laser spectroscopy of fermium isotopes — •Jessica Warbinek for the Fermium collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Germany — Johannes Gutenberg-Universität Mainz, Germany
Determining the limits of existence of the heaviest nuclides is a forefront topic in nuclear-physics research. Nuclei in this region are stabilized by shell effects that retard spontaneous fission and feature properties distinctly different from those of lighter nuclei. Experimental information on the deformed shell closures around the heavy actinides like fermium (Fm, Z=100) can help to benchmark state-of-the-art theoretical models to improve their predictive power in the range of the heaviest elements.
Laser spectroscopy serves as a powerful tool to extract experimental information on nuclear parameters such as the change in the mean-square charge radius and nuclear moments in a nuclear-model independent manner. Recent studies in fermium allowed the determination of the isotope shift in an atomic transition for a long chain of eight isotopes ranging from the accelerator-produced 245Fm to reactor-bred 257Fm. Direct and indirect production methods were combined and associated on-line and off-line measurement techniques significantly advanced to access isotopes spanning well across the known deformed shell gap at N=152. Results on the extracted changes in the mean-square charge radii revealing a discontinuity around the neutron shell closure will be discussed.