Pushing the limits of ⁴¹Ca AMS with CaF₂ 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://ucris.univie.ac.at/portal/en/publications/pushing-the-limits-of-41ca-ams-with-caf2-targets-at-dreams(ec2c4c51-7688-4fd9-a5ce-d81219ba2cec).html