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Published April 1, 1992 | public
Journal Article Open

Final report on the search for neutrinoless double-β decay of 76Ge from the Gotthard underground experiment


We report here on the final results of a search for Ge-76 double-beta decay conducted in the Gotthard underground laboratory. The detector consists of an array of eight high-purity natural germanium crystals totaling 1095 cm^3 fiducial volume. The accumulated data set represents a sensitivity of 10.0 kg yr. No indication of neutrinoless double-beta decay was found. The measured half-life limits are T1/2(0+ --> 0+) > 6.0(3.3) x 10^(23) yr for the transition to the ground state and T1/2(0+ --> 2+) > 1.4(0.65) x 10^(23) 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: < 3.6 x 10^(-6) and < 2.2 x 10^(-8).

Additional Information

©1992 The American Physical Society. Received 11 October 1991. The authors would like to thank P. Vogel for many stimulating discussions. This work was supported by the U.S. Department of Energy and the Fonds National Suisse pour la Recherche Scientifique.


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