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[en] A direct search was made for a threshold kink in 63Ni β-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 |U|2=(-0.011±0.033(stat.)±0.030(sys.) )% and its upper limit |U|2≤0.073% (95% C.L.). The result clearly excludes neutrinos with |U|2≥0.1% for the mass range from 11 to 24keV
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