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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 | Affiliation: | Max-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 | 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))^(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 | Services: | Forum | Review | PDF | Favorites |
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