Search for a heavy neutrino in the β-decay of 35S

Details Search for a heavy neutrino in the β-decay of 35S Search for a heavy neutrino in the β-decay of 35S

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318..547d&link_type=abstract

Nature, Volume 318, Issue 6046, pp. 547-548 (1985).

Physics

24

Scientific paper

Recent experimental evidence1 suggests that the neutrino (strictly, an antineutrino) emitted in the β-decay of tritium is a mixture of two mass eigen states |ν1> and |ν2> where |νe>=cos θ|ν1> + sin θ|ν2> with mν1 <50 eV and mν2 =17.1+/-0.2 keV and sin2 θ=0.03. This conclusion is based on the observation of a `kink' in the Fermi-Kurie plot2,3 of the electron energy spectrum at an energy 17.1 keV below the end point. Such an observation, if confirmed, will have far-reaching consequences in cosmology and particle physics4,5. In the experiment reported here, a search was made for such an admixture in the β-decay of 35S. We fail to confirm the presence of mixing of neutrinos with mass 17.1 keV and place an upper limit on such an admixture of 0.6% (90% confidence level).

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