Abstract
A continuing search for the no-neutrino mode of the double beta decay of has resulted in a new lower limit yr. This value corresponds to a 90% confidence level determined with a maximum-likelihood analysis of the energy interval 2041±2 keV. Combined with recent shell-model calculations, the data imply eV and a limit on lepton nonconservation . In the context of the shell model, the data imply that the electron neutrino is not a Majorana mass eigenstate.
- Received 1 November 1982
DOI:https://doi.org/10.1103/PhysRevLett.50.721
©1983 American Physical Society