Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.59: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

A novel mass calibration mode for the MR-TOF-MS at the FRS Ion Catcher — •Jens Ebert for the FRS Ion Catcher collaboration — Justus-Liebig-Universität Gießen

Fission and projectile fragments, produced in an accelerator facility at relativistic energies, must be slowed down for high-precision experiments at low energies. At the FRS Ion Catcher experiment, a test bench for the low energy branch of the Super-FRS at FAIR, this has been done in July and August 2012 for an Uranium beam with 1GeV/u fragmented on a Beryllium target. The projectile fragments were separated in-flight, range-bunched, slowed-down in the Fragment Separator (FRS) at GSI and subsequently thermalized in a cryogenic stopping cell (CSC). With the ions extracted from the CSC and transported to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) mass measurements were performed for different isobars with A=211 and A=213 like the short lived ²¹³Rn with a half-live of only 20 ms.

The data analysis of this mass measurements including a novel calibration mode for ions with different turn numbers in the analyzer of the MR-TOF-MS will be presented. This calibration mode allows high resoluted mass measurements for ions of interest without isobaric calibration ions.