A negative result for the existence of a 17keV neutrino was obtained by a very high-statistical measurement of the 63Ni β-spectrum and a response function using an iron-free magnetic spectrometer. The obtained mixing strength is |U|2 = (1.8±3.3(stat.)±3.3(sys.))×10-4, which strongly excludes the existence of a 17keV neutrino with an admixture of 1%. We set the upper limit to 0.095% on |U|2 with a 95% confidence level.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics