Upper limits on the mixing of heavy neutrinos in the beta decay of
- 1 October 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 36 (4) , 1504-1513
- https://doi.org/10.1103/physrevc.36.1504
Abstract
The beta spectrum of was studied with a π √2 beta spectrometer, a multistrip source, and multidetector array. No evidence was found for heavy neutrinos with masses ranging from 4 to 40 keV. The upper limit, including numerical evaluation of systematic errors, for the mixing of a 17 keV neutrino was set at 0.3% (90% confidence level). The beta spectrum endpoint was found to be 66.946±0.020 keV, about 1 keV higher than the value derived from the 1983 atomic mass table, 65.92±0.15 keV.
Keywords
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