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Title

41Ca measurements on the 1 MV AMS facility at the Centro Nacional de Aceleradores (CNA, Spain)

AuthorsVivo-Vilches, C.; López-Gutiérrez, J. M. ; García-León, Manuel ; VockenhubeR, Christof; Walczyk, Thomas
Keywords41Ca
Low-energy AMS
Accelerator mass spectrometry
41K interference
Issue Date2017
PublisherElsevier
CitationNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 413: 13-18 (2017)
AbstractWe present a detailed study of the performance parameters for Ca measurements at the 1 MV AMS system at the Centro Nacional de Aceleradores (CNA) in Seville. Mixing CaF with Ag, we get stable (CaF) currents between 50 and 100 nA. Transmission of the 2+ state in the He stripper is 41%, while optical transmission in the HE sector is typically higher than 95%. At low energies we cannot separate Ca from the isobar K at the detector, but the interference is reduced by using (CaF) ions. The remaining contribution is corrected by measurement of the other stable isotope of potassium, K, to estimate this interference (K-correction). After this correction, we reach a Ca/Ca background level between 5 × 10 and 8 × 10, making possible measurements of Ca/Ca ratios higher than 4 × 10. Intercomparisons with the 0.6 MV AMS system at ETH Zurich show a quite good correlation.
URIhttp://hdl.handle.net/10261/158567
Identifiersdoi: 10.1016/j.nimb.2017.10.003
issn: 0168-583X
Appears in Collections:(CNA) Artículos
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