Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Structure and Dynamics of Nuclei VIII
HK 39.4: Vortrag
Donnerstag, 19. März 2026, 17:00–17:15, AM 00.011
Evolution of changes in mean-square charge radii in californium isotopes — •Kenneth van Beek for the RADRIS collaboration — Technische Universität Darmstadt, Deutschland — GSI Helmholtzzentrum für Schwerionenforschung, Deutschland
The experimental determination of atomic and nuclear properties such as atomic energy levels, ionization potentials, electromagnetic moments, trends in mean-square charge radii, and isotope shifts for nuclei in the region of heavy elements (Z 100) remains difficult. The main challenges are low production rates at accelerator facilities and unfavorable half-lifes of the fusion products. This necessitates the use of highly efficient and selective laser spectroscopy techniques. At GSI-FAIR in Darmstadt, Germany, the RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) apparatus has been succesfully used to study aforementioned properties in 245,246,248−250,254Fm and 252−255No. The employed detection of laser ions via their α-decay became impractical for nuclei with half-lives on the order of several tens of hours using a single detector. Thus, a more versatile detector design was developed to increase the method’s reach towards longer-lived nuclei. In a recent measurement campaign, the new setup was used to investigate isotope shifts in a long isotopic chain in the element californium, including 246Cf with a half-life of t1/2=35.7 h. This talk will present laser spectroscopic results in 240,241,242,244,246Cf and the extracted information for trends in changes of mean-square charge radii, complementing former investigations of 249−253Cf at the RISIKO mass separator of the Johannes Gutenberg-University Mainz, Germany.
Keywords: Laser Spectroscopy; RADRIS; Heavy Elements; Isotope Shift; Charge Radius