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Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment

Publication ,  Journal Article
Gando, A; Gando, Y; Hanakago, H; Ikeda, H; Inoue, K; Kato, R; Koga, M; Matsuda, S; Mitsui, T; Nakada, T; Nakamura, K; Obata, A; Oki, A ...
Published in: Physical Review C - Nuclear Physics
August 6, 2012

We present limits on Majoron-emitting neutrinoless double-β decay modes based on an exposure of 112.3 days with 125 kg of 136Xe. In particular, a lower limit on the ordinary (spectral index n=1) Majoron-emitting decay half-life of 136Xe is obtained as T1/20νχ0>2.6×1024 yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is gee<(0.8-1.6) ×10-5. This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes to 0νββ decay for neutrino masses in the inverted hierarchy scheme. © 2012 American Physical Society.

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Published In

Physical Review C - Nuclear Physics

DOI

EISSN

1089-490X

ISSN

0556-2813

Publication Date

August 6, 2012

Volume

86

Issue

2

Related Subject Headings

  • Nuclear & Particles Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
 

Citation

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Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Kato, R., … Decowski, M. P. (2012). Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment. Physical Review C - Nuclear Physics, 86(2). https://doi.org/10.1103/PhysRevC.86.021601
Gando, A., Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, R. Kato, M. Koga, et al. “Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment.” Physical Review C - Nuclear Physics 86, no. 2 (August 6, 2012). https://doi.org/10.1103/PhysRevC.86.021601.
Gando A, Gando Y, Hanakago H, Ikeda H, Inoue K, Kato R, et al. Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment. Physical Review C - Nuclear Physics. 2012 Aug 6;86(2).
Gando, A., et al. “Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment.” Physical Review C - Nuclear Physics, vol. 86, no. 2, Aug. 2012. Scopus, doi:10.1103/PhysRevC.86.021601.
Gando A, Gando Y, Hanakago H, Ikeda H, Inoue K, Kato R, Koga M, Matsuda S, Mitsui T, Nakada T, Nakamura K, Obata A, Oki A, Ono Y, Shimizu I, Shirai J, Suzuki A, Takemoto Y, Tamae K, Ueshima K, Watanabe H, Xu BD, Yamada S, Yoshida H, Kozlov A, Yoshida S, Banks TI, Detwiler JA, Freedman SJ, Fujikawa BK, Han K, O’Donnell T, Berger BE, Efremenko Y, Karwowski HJ, Markoff DM, Tornow W, Enomoto S, Decowski MP. Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment. Physical Review C - Nuclear Physics. 2012 Aug 6;86(2).

Published In

Physical Review C - Nuclear Physics

DOI

EISSN

1089-490X

ISSN

0556-2813

Publication Date

August 6, 2012

Volume

86

Issue

2

Related Subject Headings

  • Nuclear & Particles Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics