High sensitivity search for a 17 keV neutrino. Negative indication with an upper limit of 0.095%

H. Kawakami, S. Kato, T. Oshima, C. Rosenfeld, H. Sakamoto, T. Sato, S. Shibata, J. Shirai, Y. Sugaya, T. Suzuki, K. Takahashi, T. Tsukamoto, K. Ueno, K. Ukai, S. Wilson, Y. Yonezawa

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36 Citations (Scopus)

Abstract

We have performed a search for a 17 keV neutrino by looking for a kink in the 63Ni β-spectrum near the expected energy threshold. Using a large number of events (2.4 × 109) accumulated in a narrow energy region with the INS iron-free π√2 β-spectrometer, we obtain a mixing strength of [1.8±3.3(stat.)±3.3(syst.)]×10-4, and no indication of the presence of a 17 keV neutrino with the order of 1% mixing. We set an upper limit of 0.095% for the admixture of a neutrino with a mass of 17 keV and of 0.1% with a mass range of 10-24 keV, at the 95% confidence level.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalPhysics Letters B
Volume287
Issue number1-3
DOIs
Publication statusPublished - 1992 Aug 6

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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