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29 March 2024
 
  » arxiv » hep-ph/0103062

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Latest Results from the Heidelberg-Moscow Double Beta Decay Experiment
H.V. Klapdor-Kleingrothaus ; A. Dietz ; L. Baudis ; G. Heusser ; I.V. Krivosheina ; S. Kolb ; B. Majorovits ; H. Paes ; H. Strecker ; V. Alexeev ; A. Balysh ; A. Bakalyarov ; S.T. Belyaev ; V.I. Lebedev ; S. Zhukov ;
Date 6 Mar 2001
Journal Eur.Phys.J. A12 (2001) 147-154
Subject hep-ph
AffiliationMax-Planck-Institut fuer Kernphysik, Heidelberg, Germany) and V. Alexeev, A. Balysh, A. Bakalyarov, S.T. Belyaev, V.I. Lebedev, S. Zhukov (Kurchatov Institute, Moscow, Russia
AbstractNew 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.
Source arXiv, hep-ph/0103062
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