Suggestive evidence for the two-neutrino double-β decay ofGe76
作者： H. S. Miley , F. T. Avignone , R. L. Brodzinski , J. I. Collar , J. H. Reeves
DOI: 10.1103/PHYSREVLETT.65.3092
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摘要: A dramatic reduction in background was achieved 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 theoretical spectrum two-neutrino {beta}{beta} decay {sup 76}Ge. fit to data yields {ital T}{sub 1/2}{sup 2{nu}}({sup 76}Ge)=(1.1{sub {minus}0.3}{sup +0.6}){times}10{sup 21} yr at 95% C.L., which agrees with shell-model predictions.
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