Limits on the Majorana neutrino mass in the 0.1 eV range

L. Baudis , A. Dietz , G. Heusser , H.V. Klapdor-Kleingrothaus , I.V. Krivosheina , St. Kolb , B. Majorovits , V.F. Melnikov

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H. Paes F. Schwamm H. Strecker (Max-Planck-Institut fuer Kernphysik Heidelberg Germany) V. Alexeev A. Balysh A. Bakalyarov S.T. Belyaev V.I. Lebedev S. Zhukov (Russian Science Centre Kurchatov Institute Moscow Russia)

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classification ✦ hep-ex

keywords massneutrinomajoranalimitallowsbetaconstraintsdata

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The Heidelberg-Moscow experiment gives the most stringent limit on the Majorana neutrino mass. After 24 kg yr of data with pulse shape measurements, we set a lower limit on the half-life of the neutrinoless double beta decay in 76Ge of T_1/2 > 5.7 * 10^{25} yr at 90% C.L., thus excluding an effective Majorana neutrino mass greater than 0.2 eV. This allows to set strong constraints on degenerate neutrino mass models.

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Limits on the Majorana neutrino mass in the 0.1 eV range

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