Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
Q 14.1: Hauptvortrag
Montag, 2. März 2026, 17:00–17:30, N 3
Isotope shifts and population dynamics in neutron-rich Mg+ measured with MIRACLS — •Konstantin Mohr for the MIRACLS collaboration — GSI Helmholtzzentrum für Schwerionenforschung
The Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS) combines a multi-reflection time-of-flight (MR-ToF) device and collinear laser spectroscopy (CLS) to overcome the current sensitivity limits of fluorescence-based collinear laser spetroscopy. By multiple ion-photon interactions in the MR-ToF device, the MIRACLS setup at the ISOLDE facility at CERN enables CLS studies of shortlived radioactive isotopes far from stability with very low yields, such as 34Mg.
Simultaneous collinear and anticollinear spectroscopy of the D1 and D2 transitions in 24−34Mg+ ions has been performed, with particular interest on 33,34Mg at the island of inversion. To extract isotope shifts – and thus probe shape coexistence driven by intruder states around the N=20 shell – a detailed understanding of the population dynamics within the hyperfine structure of the odd isotopes is essential. The resulting complex line shapes were disentangled and the effects of population redistribution quantified through rate-equation based simulations.
In this contribution, we discuss the distinctive features of the MIRACLS approach and experimental challenges associated with multiple photon-ion interactions. Furthermore, first results of the isotope shifts of the Mg isotopic chain will be presented.
Keywords: Multi-reflection time-of-flight; Collinear laser spectroscopy; Population dynamics; Hyperfine structure; Charge radii