Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: New Mass Spectrometric Methods and Technical Developments

MS 3.3: Vortrag

Montag, 23. März 2015, 17:30–17:45, PH/HS2

Multiple-Reflection Time-of-Flight Mass Spectrometer as Isomer Separator — •Jens Ebert for the FRS Ion Catcher collaboration — Justus-Liebig-Universität Gießen

Recently multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) have been established as important tools for isobar separation at several facilities for research on exotic nuclei. They combine short measurement cycles with high efficiencies and very high mass resolving power.

Through technical improvements of mass resolving power and stability, the MR-TOF-MS for the FRS Ion Catcher at GSI and the Low-Energy Branch of the Super-FRS at FAIR is now also capable to separate isomers in time and space. The spatial separation can provide isomeric clean beams for further experiments. This has been successfully demonstrated in a beamtime of the FRS Ion Catcher in October 2014. Isomers have been produced via projectile fragmentation and fission, thermalized in a cryogenic stopping cell and transported to the MR-TOF-MS, where mass measurements and spatial separation with a Bradbury-Nielsen-Gate have been performed on them. After the separation the decay of α-emitting isomers was measured with a silicon detector to verify the identity of the separated nuclides.