Direct evidence for two-neutrino double-beta decay in 82Se

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1970
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Abstract
The two-neutrino mode of double-beta decay in 82Se has been observed in a time-projection chamber at a half-life of (1.1+0.8-0.3)ĆƒĀ—1020 yr (68% confidence level). This result from direct counting confirms the earlier geochemical measurements and helps provide a standard by which to test the double-beta-decay matrix elements of nuclear theory. It is the rarest natural decay process ever observed directly in the laboratory.
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Authors Elliott, S. R.;Hahn, A. A.;Moe, M. K.;Elliott, S. R.;Hahn, A. A.;Moe, M. K.;
Journal PhRvL
Year 1970
DOI doi:10.1103/PhysRevLett.59.2020
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