0. 073% (95% C. L. ) upper limit on 17keV neutrino admixture
Conference
·
· AIP Conference Proceedings (American Institute of Physics); (United States)
OSTI ID:5669490
- National Laboratory for High Energy Physics, KEK, Oho 1-1, Tsukuba, Ibaraki 305 (Japan)
A direct search was made for a threshold kink in [sup 63]Ni [beta]-ray spectrum due possibly to a sizeable admixture of 17keV neutrino. A fine energy scan was performed using a magnetic spectrometer over the specific energy region with very high statistics and a very high signal-to-background ratio. The resultant mixing strength is [vert bar][ital U][vert bar][sup 2]=([minus]0.011[plus minus]0.033(stat.)[plus minus]0.030(sys.) )% and its upper limit [vert bar][ital U][vert bar][sup 2][le]0.073% (95% C.L.). The result clearly excludes neutrinos with [vert bar][ital U][vert bar][sup 2][ge]0.1% for the mass range from 11 to 24keV.
- OSTI ID:
- 5669490
- Report Number(s):
- CONF-920837--
- Conference Information:
- Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 272:1
- Country of Publication:
- United States
- Language:
- English
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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LEPTONS
MASS SPECTRA
MASSLESS PARTICLES
MIXING
NEUTRINOS
NICKEL 63
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NUCLEAR DECAY
NUCLEI
PARTICLE IDENTIFICATION
RADIOISOTOPES
RESPONSE FUNCTIONS
SPECTRA
YEARS LIVING RADIOISOTOPES