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A limit on the mass of the electron neutrino: The case of 163Ho |
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| Authors: | JU Andersen GJ Beyer G Charpak A De Rújula B Elbek HÅ Gustafsson PG Hansen B Jonson P Knudsen E Laegsgaard J Pedersen HL Ravn |
| Institution: | 1. Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark;2. CERN, Geneva, CH-1213 Geneva 23, Switzerland;3. Tandem Accelerator, NBI Risø, DK-4000 Roskilde, Denmark |
| Abstract: | The partial beta-decay half-life for capture of M electrons in 163Ho is (4.0 ± 1.2) × 104 yr, and the 163Ho163Dy mass difference is 2.3 ± 1.0 keV. From these independent results we deduce a half-life of (7 ± 2) × 103 yr and an upper limit on the electron neutrino mass of 1.3 keV. |
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