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A: Fachverband Atomphysik

A 7: Precision spectroscopy of atoms and ions I

A 7.1: Hauptvortrag

Montag, 9. März 2020, 14:00–14:30, f107

Laser spectroscopy of the heaviest actinides — •Premaditya Chhetri^1,2, Dieter Ackermann³, Hartmut Backe⁴, Michael Block^1,2,4, Bradley Cheal⁵, Christoph Emanuel Düllmann^1,2,4, Julia Even⁶, Rafael Ferrer⁷, Francesca Giacoppo^1,2, Stefan Götz^1,2,4, Fritz Peter Hessberger^1,2, Mark Huyse⁷, Oliver Kaleja^1,4, Jadambaa Khuyagbaatar^1,2, Peter Kunz⁸, Mustapha Laatiaoui^1,2,4, Werner Lauth⁴, Lotte Lens¹, Enrique Minaya Ramirez⁹, Andrew Mistry^1,2, Tobias Murböck¹, Sebastian Raeder^1,2, Fabian Schnieder², Piet Van Duppen⁷, Thomas Walther¹⁰, and Alexander Yakushev^1,2 — ¹GSI, Darmstadt, Germany — ²HI Mainz, Mainz, Germany — ³GANIL, Cean, France — ⁴JGU, Mainz, Germany — ⁵Liverpool University, Liverpool, UK — ⁶University of Groningen, KVI-CART, Groningen, Netherlands — ⁷KU Leuven, Leuven, Belgium — 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]. Production of ²⁵⁵No via the electron capture of ²⁵⁵Lr, at very low rate, made the measurements of hyperfine structure of ²⁵⁵No possible. 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].

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).