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Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Accelerator Mass Spectrometry 1

MS 5.5: Vortrag

Mittwoch, 7. März 2018, 15:15–15:30, R 1.020

The first (53Mn/55Mn) isotopic ratio measurements at the Cologne FN-Tandem Accelerator — •Markus Schiffer, Richard Altenkirch, Claus Müller-Gatermann, Susan Herb, Claus Feuerstein, Stefan Heinze, Alexander Stolz, and Alfred Dewald — Institute for Nuclear Physics, University of Cologne, Germany

The new AMS system at the Cologne 10 MV FN accelerator is finalized in its first stage. The system has been designed for the measurement of medium mass isotopes, especially for 53Mn and 60Fe. It provides the opportunity to use several detector systems in different combinations: degrader foils with an electrostatic analyzer, a 4m time-of-flight system, a 135 gas filled magnet and different gas ionization detectors.

The whole system was tested with measurements of stable ion beams and isotopic ratios. During the test measurements of (41Ca/40Ca) isotopic ratios without passive absorbers a detection limit lower 5.3× 10−13 was reached. A high 53Cr suppression in the (53Mn/55Mn) isotopic ratio measurement with the electrostatic analyzer was reached by using the optimal silicon nitride degrader foil thickness.

We will present the first (53Mn/55Mn) ratio measurements in a range from 10−9 to 10−10, and background spectra measured with blank sample material. Transmission tests show an overall efficiency of 0.0033%, including sputter efficiency, charge state yield, transmissions and software gates.

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