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. 2016 Aug 19;117(8):082503.
doi: 10.1103/PhysRevLett.117.082503. Epub 2016 Aug 16.

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region With KamLAND-Zen

Affiliations

Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region With KamLAND-Zen

A Gando et al. Phys Rev Lett. .

Erratum in

  • Publisher's Note: Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen [Phys. Rev. Lett. 117, 082503 (2016)].
    Gando A, Gando Y, Hachiya T, Hayashi A, Hayashida S, Ikeda H, Inoue K, Ishidoshiro K, Karino Y, Koga M, Matsuda S, Mitsui T, Nakamura K, Obara S, Oura T, Ozaki H, Shimizu I, Shirahata Y, Shirai J, Suzuki A, Takai T, Tamae K, Teraoka Y, Ueshima K, Watanabe H, Kozlov A, Takemoto Y, Yoshida S, Fushimi K, Banks TI, Berger BE, Fujikawa BK, O'Donnell T, Winslow LA, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Detwiler JA, Enomoto S, Decowski MP; KamLAND-Zen Collaboration. Gando A, et al. Phys Rev Lett. 2016 Sep 2;117(10):109903. doi: 10.1103/PhysRevLett.117.109903. Epub 2016 Sep 2. Phys Rev Lett. 2016. PMID: 27636501

Abstract

We present an improved search for neutrinoless double-beta (0νββ) decay of ^{136}Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the ^{110m}Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T_{1/2}^{0ν}>1.07×10^{26} yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.

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