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
Abstract
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))(0nu) > 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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