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Calorimetric low temperature detectors for low-energetic heavy ions and their application in accelerator mass spectrometry

Rev. Sci. Instrum. 80, 103304 (2009); doi:10.1063/1.3213622

Published 26 October 2009

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S. Kraft-Bermuth,1 V. A. Andrianov,1 A. Bleile,1 A. Echler,1 P. Egelhof,1 A. Kiseleva,1 O. Kiselev,1 H. J. Meier,1 J. P. Meier,1 A. Shrivastava,1 M. Weber,1 R. Golser,2 W. Kutschera,2 A. Priller,2 P. Steier,2 and C. Vockenhuber2
1Gesellschaft für Schwerionenforschung GSI, D-64291 Darmstadt, Germany and Institut für Physik, Johannes Gutenberg Universität, D-55099 Mainz, Germany
2Vienna Environmental Research Accelerator, Universität Wien, A-1090 Wien, Austria
The energy-sensitive detection of heavy ions with calorimetric low temperature detectors was investigated in the energy range of E=0.1–1  MeV/amu, commonly used for accelerator mass spectrometry (AMS). The detectors used consist of sapphire absorbers and superconducting aluminum transition edge thermometers operated at T~1.5  K. They were irradiated with various ion beams (13C,197Au,238U) provided by the VERA tandem accelerator in Vienna, Austria. The relative energy resolution obtained was DeltaE/E=(5–9)×10−3, even for the heaviest ions such as 238U. In addition, no evidence for a pulse height defect was observed. This performance allowed for the first time to apply a calorimetric low temperature detector in an AMS experiment. The aim was to precisely determine the isotope ratio of 236U/238U for several samples of natural uranium, 236U being known as a sensitive monitor for neutron fluxes. Replacing a conventionally used detection system at VERA by the calorimetric detector enabled to substantially reduce background from neighboring isotopes and to increase the detection efficiency. Due to the high sensitivity achieved, a value of 236U/238U=6.1×10−12 could be obtained, representing the smallest 236U/238U ratio measured at the time. In addition, we contributed to establishing an improved material standard of 236U/238U, which can be used as a reference for future AMS measurements. ©2009 American Institute of Physics
History: Received 13 May 2009; accepted 9 August 2009; published 26 October 2009
Permalink: http://link.aip.org/link/?RSINAK/80/103304/1
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0034-6748 (print)   1089-7623 (online)
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