SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Precision spectroscopy of atoms and ions / Highly charge ions (joint session A/Q)

A 15.1: Hauptvortrag

Mittwoch, 22. September 2021, 14:00–14:30, H1

Laser spectroscopy of the heaviest actinides — •Premaditya Chhetri^1,2,3, Dieter Ackermann⁴, Hartmut Backe⁵, Michael Block^1,2,5, Bradley Cheal⁶, Christoph Emanuel Düllmann^1,2,5, Julia Even⁷, Rafael Ferrer³, Francesca Giacoppo^1,2, Stefan Götz^1,2,5, Fritz Peter Hessberger^1,2, Mark Huyse³, Oliver Kaleja^1,5, Jadambaa Khuyagbaatar^1,2, Peter Kunz⁸, Mustapha Laatiaoui^1,2,5, Werner Lauth⁵, Lotte Lens¹, Enrique Minaya Ramirez⁹, Andrew Mistry^1,2, Tobias Murböck¹, Sebastian Raeder^1,2, Fabian Schnieder², Piet Van Duppen³, Thomas Walther¹⁰, and Alexander Yakushev^1,2 — ¹GSI, Darmstadt, Germany — ²HI Mainz, Mainz, Germany — ³KU Leuven, Leuven, Belgium — ⁴GANIL, Cean, France — ⁵JGU, Mainz, Germany — ⁶Liverpool University, Liverpool, UK — ⁷University of Groningen, KVI-CART, Groningen, Netherlands — ⁸TRIUMF, Vancouver, Canada — ⁹IPN, Orsay, France — ¹⁰TU Darmstadt, Darmstadt, Germany

Precision measurements of optical transitions of the heaviest elements are a versatile tool to probe the electronic shell structure which is strongly influenced by electron-electron correlations, relativity and QED effects. Optical studies of transfermium elements with Z>100 is hampered by low production rates and the fact that any atomic information is initially available only from theoretical predictions. Using the sensitive RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique coupled to the SHIP separator at GSI, a strong optical ¹S₀→¹P₁ ground-state transition in the element nobelium (Z=102) was identified and characterized [1]. The isotopes of ^252,253,254No were measured [2]. From these measurements, nuclear information on the shapes and sizes were inferred. In addition, several high-lying Rydberg levels were observed, which enabled the extraction of the first ionization potential with high precision [3]. Using an indirect production mechanism, laser spectroscopy was performed on some Fermium isotopes. These results as well as the prospects for future exploration of the atomic structure of the next heavier element, lawrencium (Z=103) will be discussed.

[1] M. Laatiaoui et al., Nature 538, 495 (2016).

[2] S. Raeder et al., PRL 120, 232503 (2018).

[3] P. Chhetri et al., PRL 120, 263003 (2018).