Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Precision Mass Spectrometry

MS 2.3: Vortrag

Montag, 11. März 2019, 14:45–15:00, U A-Esch 2

Recent Developments at the FRS Ion Catcher — •Christine Hornung¹, Daler Amanbayev¹, Samuel Ayet^1,2, Sönke Beck¹, Julian Bergmann¹, Timo Dickel^1,2, Hans Geissel^1,2, Florian Greiner¹, Lizzy Gröf¹, Gabriella Kripko-Koncz¹, Ivan Miskun¹, Wolfgang Plaß^1,2, Christoph Scheidenberger^1,2, and the FRS Ion Catcher Collaboration¹ — ¹II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

At the FRS Ion Catcher at GSI/FAIR, projectile and fission fragments are produced at relativistic energies at the FRS, separated in-flight, range-focused, slowed-down and thermalized in a cryogenic stopping cell (CSC) and transmitted to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). With the MR-TOF-MS direct mass measurements of more than 30 exotic nuclei were performed, achieving mass accuracies down to 6E-8. These precision measurements show the need to improve current mass models for nuclei in the vicinity of the doubly magic nucleus ²⁰⁸Pb.

The FRS Ion Catcher was also used to measure half-lives and branching ratios with a novel technique. This has been tested with the short-lived α-emitting nuclide ²¹⁶Po and for the second excited state of ¹¹⁹Sb. These results and recent technical upgrades of the RFQ beamline, connecting the CSC with the MR-TOF-MS, (an RFQ switch yard, a calibration source and a dedicated RFQ mass filter) will be presented.