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Latest Results from the Heidelberg-Moscow Double Beta Decay Experiment

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arxiv hep-ph/0103062 v1 pith:HMU5HMJW submitted 2001-03-06 hep-ph

H.V. Klapdor-Kleingrothaus , A. Dietz , L. Baudis , G. Heusser , I.V. Krivosheina , S. Kolb , B. Majorovits , H. Paes
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H. Strecker (Max-Planck-Institut fuer Kernphysik Heidelberg Germany) V. Alexeev A. Balysh A. Bakalyarov S.T. Belyaev V.I. Lebedev S. Zhukov (Kurchatov Institute Moscow Russia)
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New results for the double beta decay of 76Ge are presented. They are extracted from Data obtained with the HEIDELBERG-MOSCOW, which operates five enriched 76Ge detectors in an extreme low-level environment in the GRAN SASSO. The two neutrino accompanied double beta decay is evaluated for the first time for all five detectors with a statistical significance of 47.7 kg y resulting in a half life of (T_(1/2))^(2nu) = [1.55 +- 0.01 (stat) (+0.19) (-0.15) (syst)] x 10^(21) years. The lower limit on the half-life of the 0nu beta-beta decay obtained with pulse shape analysis is (T_(1/2))^(0_nu) > 1.9 x 10^(25) [3.1 x 10^(25)] years with 90% C.L. (68% C.L.) (with 35.5 kg y). This results in an upper limit of the effective Majorana neutrino mass of 0.35 eV (0.27 eV). No evidence for a Majoron emitting decay mode or for the neutrinoless mode is observed.

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    Combining 0νββ decay experiment results with ab initio nuclear matrix elements in a Bayesian framework yields stronger global Majorana neutrino mass limits than individual experiments, indicating current searches have...

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