Abstract
The HEIDELBERG-MOSCOW experiment operating 11kg of enriched 76 Ge in the GRAN SASSO Underground Laboratory, is one of the long-running underground experiments. It is the most sensitive double beta decay experiment since more than ten years. The measurement, and the analysis of the data taken from 2 August 1990 — 20 May 2003, which has been performed in the second half of 2003, is presented here. 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 a 4.2 σ level. Fundamental consequences of this first evidence for neutrinoless double beta decay is that total lepton number is not conserved, and that the neutrino is a Majorana particle. The effective neutrino mass deduced is (0.2 – 0.6) eV. Recent information from various independent sides seems to condense now to a nonvanishing neutrino mass of the order of the value found by the HEIDELBERGMOSCOW experiment. This is the case for the results from CMB, LSS, SDSS, neutrino oscillations, tritium beta decay, particle theory and cosmology.
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Klapdor-Kleingrothaus, H.V. (2004). The HEIDELBERG-MOSCOW 76 Ge Double Beta Experiment in Gran Sasso 1990-2003 and Status of Absolute Neutrino Mass. In: Klapdor-Kleingrothaus, H.V. (eds) Beyond the Desert 2003. Springer Proceedings in Physics, vol 92. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18534-2_21
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