SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 26: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)

A 26.4: Talk

Thursday, March 9, 2023, 15:30–15:45, F303

Laser spectroscopy of fermium across the deformed N=152 shell closure — •Elisabeth Rickert for the Fermium collaboration — GSI Darmstadt, Germany — JGU Mainz, Germany — HIM Mainz, Germany

The existence and stability of heavy nuclei is a forefront topic in nuclear physics. Modern laser spectroscopy techniques provide a unique tool to study nuclear shell effects by measuring isotope shifts to infer mean-square charge radii and hence deduce nuclear size and shape. Laser spectroscopy measurements of the isotope shift of an atomic transition of the actinide element fermium (Z=100) have been recently carried out covering isotopes across the N=152 shell closure. On-line and off-line laser spectroscopy experiments with direct and indirect production schemes and offline production methods were combined and methodologically pushed forward to measure isotope shifts in fermium isotopes. Previously inaccessible isotopes, short and long-lived, were covered, enabling experiments at atom-at-a-time quantities through newly developed detection concepts. Changes in the mean-square charge radii were extracted for the longest chain of isotopes investigated in the region of the heavy actinides revealing a discontinuity around the N=152 shell closure.