Collinear laser spectroscopy on neutron-rich actinium isotopes

Ruohong Li; Andrea Teigelhöfer; Jiguang Li; Jacek Bieroń; András Gácsbaranyi; Jake Johnson; Per Jönsson; Victoria Karner; Mingxuan Ma; Martin Radulov; Mathias Roman; Monika Stachura; Jens Lassen

Collinear laser spectroscopy on neutron-rich actinium isotopes

Nuclear Experiment 2025-03-19 v1 Atomic Physics

Authors: Ruohong Li , Andrea Teigelhöfer , Jiguang Li , Jacek Bieroń , András Gácsbaranyi , Jake Johnson , Per Jönsson , Victoria Karner , Mingxuan Ma , Martin Radulov , Mathias Roman , Monika Stachura , Jens Lassen

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Abstract

High-resolution collinear laser spectroscopy of neutron-rich actinium has been performed at TRIUMF's isotope separator and accelerator facility ISAC. By probing the $7s^2~^1S_0$ $\rightarrow$ $6d7p~^1P_1$ ionic transition, the hyperfine structures and optical isotope shifts in $^{225, 226, 228, 229}\!$ Ac $^+$ have been measured. This allows precise determinations of the changes in mean-square charge radii, magnetic dipole moments, and electric quadrupole moments of these actinium isotopes. The improved precision of charge radii and magnetic moments clears the ambiguity in the odd-even staggering from previous studies. The electric quadrupole moments of $^{225, 226, 228, 229}\!$ Ac are determined for the first time.

Keywords

laser spectroscopy neutron-rich isotopes actinium hyperfine structure isotope shift

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@article{arxiv.2503.13732,
  title  = {Collinear laser spectroscopy on neutron-rich actinium isotopes},
  author = {Ruohong Li and Andrea Teigelhöfer and Jiguang Li and Jacek Bieroń and András Gácsbaranyi and Jake Johnson and Per Jönsson and Victoria Karner and Mingxuan Ma and Martin Radulov and Mathias Roman and Monika Stachura and Jens Lassen},
  journal= {arXiv preprint arXiv:2503.13732},
  year   = {2025}
}

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34 pages, 10 figures and 3 tables

Collinear laser spectroscopy on neutron-rich actinium isotopes

Abstract

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