SAMOP 2021 – scientific programme
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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: Invited Talk
Wednesday, September 22, 2021, 14:00–14:30, H1
Laser spectroscopy of the heaviest actinides — •Premaditya Chhetri1,2,3, Dieter Ackermann4, Hartmut Backe5, Michael Block1,2,5, Bradley Cheal6, Christoph Emanuel Düllmann1,2,5, Julia Even7, Rafael Ferrer3, Francesca Giacoppo1,2, Stefan Götz1,2,5, Fritz Peter Hessberger1,2, Mark Huyse3, Oliver Kaleja1,5, Jadambaa Khuyagbaatar1,2, Peter Kunz8, Mustapha Laatiaoui1,2,5, Werner Lauth5, Lotte Lens1, Enrique Minaya Ramirez9, Andrew Mistry1,2, Tobias Murböck1, Sebastian Raeder1,2, Fabian Schnieder2, Piet Van Duppen3, Thomas Walther10, and Alexander Yakushev1,2 — 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).