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Search for neutrinoless double beta decay with enriched 76Ge in Gran Sasso 1990-2003

H. V. Klapdor-Kleingrothaus·I. V. Krivosheina·A. Dietz·O. Chkvorets
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Abstract

The results of the HEIDELBERG-MOSCOW experiment which searches with 11 kg of enriched 76Ge for double beta decay in the GRAN Sasso underground laboratory are presented for the full running period August 1990 - May 2003. The duty cycle of the experiment was ~80%, the collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/ kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events. The confidence level for the neutrinoless signal has been improved to 4.2 sigma.

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H. V. Klapdor-Kleingrothaus, I. V. Krivosheina, A. Dietz, O. Chkvorets. 2004-04-08. Search for neutrinoless double beta decay with enriched 76Ge in Gran Sasso 1990-2003. https://doi.org/10.1016/j.physletb.2004.02.025

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