https://doi.org/10.1140/epja/i2015-15029-8
Regular Article - Experimental Physics
Determination of the extraction efficiency for 233U source α-recoil ions from the MLL buffer-gas stopping cell
1
Ludwig-Maximilians-Universität München, Am Coulombwall 1, Garching, Germany
2
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, Darmstadt, Germany
3
Helmholtz Institut Mainz, Johann-Joachim-Becherweg 36, Mainz, Germany
* e-mail: L.Wense@physik.uni-muenchen.de
Received:
25
September
2014
Revised:
11
February
2015
Accepted:
13
February
2015
Published online:
6
March
2015
Following the α decay of 233U, 229Th recoil ions are shown to be extracted in a significant amount from the MLL buffer-gas stopping cell. The produced recoil ions and subsequent daughter nuclei are mass purified with the help of a customized quadrupole mass spectrometer. The combined extraction and mass purification efficiency for 229Th3+ is determined via MCP-based measurements and via the direct detection of the 229Th α decay. A large value of (10±2)% for the combined extraction and mass purification efficiency of 229Th3+ is obtained at a mass resolution of about 1u/e. In addition to 229Th, also other α-recoil ions of the 233, 232U decay chains are addressed.
© SIF, Springer-Verlag Berlin Heidelberg, 2015