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199119992007201520230246810
Abstract: (APS)
A dramatic reduction in background was achieved in the latest Pacific Northwest Laboratory–University of South Carolina germanium detectors. Two 1.05-kg natural-isotopic-abundance detectors were operated for 1.92 kg yr. The residual spectrum, after straightforward corrections, has a significant region resembling the theoretical spectrum of the two-neutrino ββ decay of Ge76. A fit to the data yields T1/22ν(76Ge)=(1.1−0.3+0.6)×1021 yr at the 95% C.L., which agrees with shell-model predictions.
  • nucleus: semileptonic decay
  • semileptonic decay: nucleus
  • final state: (2neutrino)
  • (2neutrino): final state
  • germanium: lifetime
  • energy spectrum
  • experimental results