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

被引：10

作者：

Kraft-Bermuth, S. ^{[1
,2
]}

Andrianov, V. A. ^{[1
,2
]}

Bleile, A. ^{[1
,2
]}

Echler, A. ^{[1
,2
]}

Egelhof, P. ^{[1
,2
]}

Kiseleva, A. ^{[1
,2
]}

Kiselev, O. ^{[1
,2
]}

Meier, H. J. ^{[1
,2
]}

Meier, J. P. ^{[1
,2
]}

Shrivastava, A. ^{[1
,2
]}

Weber, M. ^{[1
,2
]}

Golser, R. ^{[3
]}

Kutschera, W. ^{[3
]}

Priller, A. ^{[3
]}

Steier, P. ^{[3
]}

Vockenhuber, C. ^{[3
]}

机构：

[1] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany

[2] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[3] Univ Vienna, Vienna Environm Res Accelerator, A-1090 Vienna, Austria

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2009年 / 80卷 / 10期

关键词：

AMS; PHYSICS; SAMPLES; U-236;

D O I：

10.1063/1.3213622

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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 similar to 1.5 K. They were irradiated with various ion beams ((13)C, (197)Au, (238)U) provided by the VERA tandem accelerator in Vienna, Austria. The relative energy resolution obtained was Delta E/E= (5-9) X 10(-3), even for the heaviest ions such as (238)U. 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 (236)U/(238)U for several samples of natural uranium, (236)U 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 (236)U/(238)U=6.1 X 10(-12) could be obtained, representing the smallest (236)U/(238)U ratio measured at the time. In addition, we contributed to establishing an improved material standard of (236)U/(238)U, which can be used as a reference for future AMS measurements. (C) 2009 American Institute of Physics. [doi:10.1063/1.3213622]

引用

页数：9

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