Upper Limits On The Mixing Of Heavy Neutrinos In The Beta-Decay Of Ni-63
PHYSICAL REVIEW C(1987)
Abstract
The beta spectrum of $^{63}\\mathrm{Ni}$ was studied with a \\ensuremath{\\pi} \\ensuremath{\\surd}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\\ifmmode\\pm\\else\\textpm\\fi{}0.020 keV, about 1 keV higher than the value derived from the 1983 atomic mass table, 65.92\\ifmmode\\pm\\else\\textpm\\fi{}0.15 keV.
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Key words
elementary particles,systematic error,confidence level,nickel,spectrum,mass spectra,beta decay
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