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, H. Paes, F. Schwamm and, H. Strecker (Max-Planck-Institut fuer Kernphysik, Heidelberg, Germany) V., Alexeev, A. Balysh, A. Bakalyarov, S.T. Belyaev
TL;DR
This paper reports a new lower limit on the half-life of neutrinoless double beta decay in germanium-76, which constrains the effective Majorana neutrino mass to below 0.2 eV, impacting neutrino mass models.
Contribution
It provides the most stringent experimental limit on the Majorana neutrino mass using pulse shape measurements in the Heidelberg-Moscow experiment.
Findings
Lower limit on half-life: T_1/2 > 5.7 x 10^{25} yr
Effective Majorana neutrino mass constrained to < 0.2 eV
Excludes certain degenerate neutrino mass models
Abstract
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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