Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 14: Accelerator Mass Spectrometry and Applications 4
MS 14.6: Vortrag
Freitag, 27. März 2015, 12:30–12:45, PH/HS2
AMS with 93Zr — •Boyana Deneva, Thomas Faestermann, Leticia Fimiani, José Gomez Guzman, Karin Hain, Peter Ludwig, and Gunther Korschinek — Technische Universität München, Physik Department, Garching
The isotope 93Zr with its long half life of 1.6x106 years is produced in a nuclear reactor as a fission product or by neutron capture from the stable 92Zr in the reactor cladding. It is thus the most important zirconium isotope considering spent nuclear fuel storage and disposal assessment on long terms. The quantitative detection of 93Zr allows also a measurement of 92Zr (n,γ) 93Zr reaction cross section relevant for the nucleosynthesis s-process, and to search for traces of 93Zr from interstellar material in exclusive deposits or for hydrological and radioactive waste tracing. One of the difficulties in identifying 93Zr by AMS is the isobaric interference of the stable 93Nb. The adequate separation of these isobars is our goal in the ongoing measurements. In order to investigate the possibility of using the energy loss in a passive absorber we carried out stopping power measurements of 92Zr and 94Zr to estimate that of 93Zr. An experimental determination of the stopping power of 93Nb is performed by using silicon nitride passive absorbers of different thicknesses. The results are compared with SRIM simulations and the estimations for 93Zr to understand the behavior of 93Zr ions in a Si3N4 passive absorber. This is crucial for the developments and optimizations of an AMS set up for the detection of 93Zr.