Ar-39 Detection at the 10^-16 Isotopic Abundance Level with Atom Trap Trace Analysis

Details Ar-39 Detection at the 10^-16 Isotopic Abundance Level with Atom Trap Trace Analysis Ar-39 Detection at the 10^-16 Isotopic Abundance Level with Atom Trap Trace Analysis

2011-01-15

arxiv.org/abs/1101.2933v1

Phys. Rev. Lett. 106:103001,2011

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.106.103001

Atom Trap Trace Analysis (ATTA), a laser-based atom counting method, has been applied to analyze atmospheric Ar-39 (half-life = 269 yr), a cosmogenic isotope with an isotopic abundance of 8x10^-16. In addition to the superior selectivity demonstrated in this work, counting rate and efficiency of ATTA have been improved by two orders of magnitude over prior results. Significant applications of this new analytical capability lie in radioisotope dating of ice and water samples and in the development of dark matter detectors.

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