Köln 2025 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: New Methods, Technical Development I

MS 2.1: Hauptvortrag

Montag, 10. März 2025, 16:45–17:15, HS 2 Chemie

Non destructive mass and lifetime measurement of unstable nuclear states in heavy ion storage rings — •Shahab Sanjari — GSI Darmstadt

Storage rings provide a unique experimental environment for non-destructive measurements of the mass and lifetimes of unstable nuclei and/or their isomeric states. With their high resolution, cavity-based Schottky detectors provide the speed and sensitivity required for such measurements. In order to increase the measurement accuracy, the velocity spread of the particles must be addressed. In the past, the electron cooler was used for this purpose. However, since the cooling time is on the order of seconds, efforts have been made to perform measurements of shorter-lived states by tuning the lattice of the storage ring to the isochronous ion-optical mode. During the last beam times, the isochronous mode was successfully used in combination with sensitive and fast non-destructive Schottky detectors (S+IMS method), thus combining the measurement of short lifetimes with high frequency resolution. In order to further improve the accuracy of mass measurements using non-destructive Schottky cavities, the effect of velocity outside the isochronous window needs to be addressed. For this purpose, a novel position sensitive detector structure was simulated, designed and constructed at GSI for use in the R3 storage ring at RIKEN. In this work we describe the successful application of the new combined Schottky and isochronous mass (and lifetime) spectroscopy (S+IMS) method. The experimental setup, used detectors and methods are described and future perspectives are discussed.

Keywords: mass; lifetime; heavy ion storage rings; isomers; nuclides