Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Precision Mass Spectrometry (joint session MS/Q)

Q 15.7: Talk

Monday, March 2, 2026, 18:45–19:00, N 6

Schottky + Isochronous Mass Spectrometry: Methodology and Results (on behalf of the Experimental Storage Ring Collaboration) — •David Freire Fernandez — University of Cologne, Cologne, Germany

We present a detailed account of Schottky+Isochronous Mass Spectrometry (S+IMS), a novel experimental technique for high-precision nuclear measurements in heavy-ion storage rings. This hybrid method combines the isochronous mode of the GSI-ESR with non-destructive, time-resolved resonant Schottky detectors. We describe the experimental setup, ring tuning procedures, and data analysis workflow. The technique achieves a mass resolving power enabling the separation of isomers with excitation energies down to 100 keV.

To demonstrate the method’s capabilities, we present high-precision mass measurements from recent experimental campaigns. These results determine nuclide masses with uncertainties in the keV range, confirming most literature values while revealing significant deviations and improved precision for specific cases, such as 72As and 69As. This work details the methodological foundation for the recent observation of the two-photon decay of 72Ge (Phys. Rev. Lett. 133, 022502) and establishes S+IMS as a powerful tool for exploring short-lived isomers across the nuclear landscape.

Keywords: Storage ring; Mass; Lifetime; Spectrometry; Spectroscopy