Published November 15, 1992
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New limits on the 17 keV neutrino
Abstract
We present results of new measurements of the β spectrum of 35S, using the Caltech double-focusing, iron-free β spectrometer. Our data show no evidence for a heavy neutrino with a mass between 12 and 22 keV admixed to the usual light neutrino. In particular, we rule out, at the 6σ level, a 17 keV neutrino admixed at 0.85%, and give an upper limit (90% C.L.) of 0.2% for such a neutrino admixture. To demonstrate that our experiment is sensitive to spectral features such as those from heavy neutrinos we have induced an artificial kink by means of an absorber foil covering part of the source.
Additional Information
©1992 The American Physical Society. Received 20 July 1992. We wish to thank Petr Vogel for generous advice throughout this work. The help of H.-W. Becker, V. Novikov, and A. Young is gratefully acknowledged. The research was supported by the Department of Energy under Grant No. DE-FG03-88ER40397.Files
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