Phys. Rev. Lett. 86, 1978–1981 (2001)Limits on the Existence of Heavy Neutrinos in the Range 50–1000 eV from the Study of the 187Re Beta DecayReceived 12 October 2000; published in the issue dated 5 March 2001 We analyzed the spectrum of the 187Re beta decay, obtained with a cryogenic microcalorimeter, searching for heavy neutrinos in the mass range 50–1000 eV. No evidence has been found for them and the upper limits on the mixing angle with a zero-mass neutrino are reported. Upper limits of 9×10-3 at 1000eV/c2, 1.2×10-2 at 500eV/c2, 4.4×10-2 at 200eV/c2, and 0.116 at 100eV/c2 at 95% C.L. have been obtained. These upper limits are a factor of 2 to 4 lower than the current limits reported in the literature. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.1978
DOI:
10.1103/PhysRevLett.86.1978
PACS:
23.40.Bw, 07.20.Mc, 14.60.Pq, 29.40.Vj
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