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

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Klapdor-Kleingrothaus,  H.V.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Krivosheina,  I.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Dietz,  A.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Chkvorets,  O.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Klapdor-Kleingrothaus, H., Krivosheina, I., Dietz, A., & Chkvorets, O. (2004). Search for neutrinoless double beta decay with enriched 76Ge in Gran Sasso 1990-2003. Physics Letters B, 586(3-4), 198-212.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8D2B-5
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 yr. The background achieved in the energy region of the Q value for double beta decay is 0.11 events kg-1 yr -1 keV-1 . 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 4.2σ.