Abstract
We report here on the final results of a search for double- decay conducted in the Gotthard underground laboratory. The detector consists of an array of eight high-purity natural germanium crystals totaling 1095 fiducial volume. The accumulated data set represents a sensitivity of 10.0 kg yr. No indication of neutrinoless double- decay was found. The measured half-life limits are yr for the transition to the ground state and yr for the transition to the first excited state at 68% (90%) C.L. From these results we derive an upper limit for the Majorana mass of the neutrino in the range of 1.8 to 6.7 eV depending on matrix-element calculations. The same results allow limits to be set for the right-handed-current parameters: and .
- Received 11 October 1991
DOI:https://doi.org/10.1103/PhysRevD.45.2548
©1992 American Physical Society