Highly sensitive AMS measurements of $^53$Mn
M. Poutivtsev and I. Dillmann and T. Faestermann and K. Knie and G. Korschinek and J. Lachner and A. Meier and G. Rugel and A. Wallner
Keywords
53Mn measurements
Abstract
Our AMS system, with the gas-filled detector system GAMS, has been optimized for measurements with 53Mn. A high sensitivity has been achieved. A newly installed cesium sputter ion source yields an improved emittance, and thus a higher mass resolution. By the extraction of the manganese molecule MnF- instead of MnO- we can suppress the isobaric chromium background in the ion source by more than a factor of three. The GAMS system achieves an isobaric suppression factor of about 3 x 10^8. Measurements on blank samples yielded upper limits for the 53Mn/55Mn ratios of 7 x 10^(-15).
