Publications
Pushing the limits of <sup>41</sup>Ca AMS with CaF<sub>2</sub> targets at DREAMS
- Author(s)
- Carlos Vivo-Vilches, Georg Rugel, Johannes Lachner, Dominik Koll, Konstanze Stübner, Sebastian Fichter, Stephan Winkler, Anton Wallner
- Abstract
The performance of 41Ca measurements at the 6 MV AMS system at HZDR, DREAMS (DREsden AMS) was improved in terms of overall efficiency and suppression of interfering isobar 41K. Mixing CaF2 samples not only with Ag, but also with PbF2 increases the negative ionization efficiency by a factor 3, from 0.15% to 0.45%. This option is dedicated to low level samples because ion source parameters have to be lowered, which increases the measurement time. In general, 41K–suppression factor of the detector is improved from 2 × 104 to 4 × 104 by advances in the analysis of the spectra. With such improvements, a 95% confidence level (C.L.) sensitivity for the 41Ca/40Ca ratio of 2 × 10–15 can be achieved at DREAMS.
- Organisation(s)
- Isotope Physics
- External organisation(s)
- Helmholtz-Zentrum Dresden-Rossendorf
- Journal
- Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
- Volume
- 540
- Pages
- 188-193
- No. of pages
- 6
- ISSN
- 0168-583X
- DOI
- https://doi.org/10.1016/j.nimb.2023.04.050
- Publication date
- 07-2023
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103014 Nuclear physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics, Instrumentation
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/ec2c4c51-7688-4fd9-a5ce-d81219ba2cec