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Data acquisition and analysis of the 76Ge double beta experiment 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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Dietz,  A.
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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Chkvorets,  O.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Klapdor-Kleingrothaus, H., Dietz, A., Krivosheina, I., & Chkvorets, O. (2004). Data acquisition and analysis of the 76Ge double beta experiment in Gran Sasso 1990-2003. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 522(3), 371-406.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-8D2D-1
Abstract
Data acquisition in a long-running underground experiment has its specific experimental challenges, concerning data acquisition, stability of the experiment and background reduction. These problems are addressed here for the HEIDELBERG-MOSCOW experiment, which collected data in the period August 1990-May 2003. The measurement and the analysis of the data are presented. The duty cycle of the experiment was ~80%, and the collected statistics is 71.7 kg year. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg year 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 a 4 level.