Pushing the limits of ⁴¹Ca AMS with CaF₂ targets at DREAMS

Autor(en)

Carlos Vivo-Vilches, Georg Rugel, Johannes Lachner, Dominik Koll, Konstanze Stübner, Sebastian Fichter, Stephan Winkler, Anton Wallner

Abstrakt

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(en)

Isotopenphysik

Externe Organisation(en)

Helmholtz-Zentrum Dresden-Rossendorf

Journal

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

Band

540

Seiten

188-193

Anzahl der Seiten

6

ISSN

0168-583X

DOI

https://doi.org/10.1016/j.nimb.2023.04.050

Publikationsdatum

07-2023

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics, Instrumentation

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ec2c4c51-7688-4fd9-a5ce-d81219ba2cec