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

Publication ,  Journal Article
Gando, A; Gando, Y; Hachiya, T; Hayashi, A; Hayashida, S; Ikeda, H; Inoue, K; Ishidoshiro, K; Karino, Y; Koga, M; Matsuda, S; Mitsui, T ...
Published in: Physical review letters
August 2016

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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Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

August 2016

Volume

117

Issue

8

Start / End Page

082503

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

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Gando, A., Gando, Y., Hachiya, T., Hayashi, A., Hayashida, S., Ikeda, H., … KamLAND-Zen Collaboration, . (2016). Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. Physical Review Letters, 117(8), 082503. https://doi.org/10.1103/physrevlett.117.082503
Gando, A., Y. Gando, T. Hachiya, A. Hayashi, S. Hayashida, H. Ikeda, K. Inoue, et al. “Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen.Physical Review Letters 117, no. 8 (August 2016): 082503. https://doi.org/10.1103/physrevlett.117.082503.
Gando A, Gando Y, Hachiya T, Hayashi A, Hayashida S, Ikeda H, et al. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. Physical review letters. 2016 Aug;117(8):082503.
Gando, A., et al. “Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen.Physical Review Letters, vol. 117, no. 8, Aug. 2016, p. 082503. Epmc, doi:10.1103/physrevlett.117.082503.
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. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen. Physical review letters. 2016 Aug;117(8):082503.

Published In

Physical review letters

DOI

EISSN

1079-7114

ISSN

0031-9007

Publication Date

August 2016

Volume

117

Issue

8

Start / End Page

082503

Related Subject Headings

  • General Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences