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SAMOP 2021 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry II

MS 8.3: Talk

Thursday, September 23, 2021, 14:30–14:45, H3

Relative Formation Probabilities for Fluoride and Oxyfluoride Anions of U, Np, Pu and Am in Accelerator Mass Spectrometry Measurements at VERA — •Andreas Wiederin1, Robin Golser1, Karin Hain1, Michael Kern1, Aya Sakaguchi2, and Peter Steier11University of Vienna, Faculty of Physics - Isotope Physics — 2University of Tsukuba, Faculty of Pure and Applied Science

The relative formation probabilities for a range of (oxy-)fluoride molecular anions of uranium, neptunium, plutonium, and americium during the sputtering process in an AMS ion source from an iron oxide matrix mixed with PbF2 have been systematically investigated at VERA. Identifying this distribution is an important step towards the separation of U and Np isobars via element selective photodetachment and reactive gases in the ILIAMS ion-cooler. A suitable choice of extracted molecular anions can be used to suppress U by an order of magnitude compared to Np. Finally, the distribution and in particular the AF4 to AF5 ratio can help to identify isobaric contaminations for the mentioned actinides. This method was used to estimate the co-production of 236U during Th irradiation which is considered for the production of 236Np, a potential isotopic spike for 237Np.

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