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

A. Gando; Y. Gando; H. Hanakago; H. Ikeda; K. Inoue; R. Kato; M. Koga; S. Matsuda; T. Mitsui; T. Nakada; K. Nakamura; A. Obata; A. Oki; Y. Ono; I. Shimizu; J. Shirai; A. Suzuki; Y. Takemoto; K. Tamae; K. Ueshima; H. Watanabe; B. D. Xu; S. Yamada; H. Yoshida; A. Kozlov; S. Yoshida; T. I. Banks; J. A. Detwiler; S. J. Freedman; B. K. Fujikawa; K. Han; T. O'Donnell; B. E. Berger; Y. Efremenko; H. J. Karwowski; D. M. Markoff; W. Tornow; S. Enomoto; M. P. Decowski

doi:10.1103/PhysRevC.86.021601

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

A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, R. Kato, M. Koga, S. Matsuda, T. Mitsui, T. Nakada, K. Nakamura, A. Obata, A. Oki, Y. Ono, I. Shimizu, J. Shirai, A. Suzuki, Y. Takemoto, K. Tamae, K. UeshimaH. Watanabe, B. D. Xu, S. Yamada, H. Yoshida, A. Kozlov, S. Yoshida, T. I. Banks, J. A. Detwiler, S. J. Freedman, B. K. Fujikawa, K. Han, T. O'Donnell, B. E. Berger, Y. Efremenko, H. J. Karwowski, D. M. Markoff, W. Tornow, S. Enomoto, M. P. Decowski

ニュートリノ科学研究センター

研究成果: Article › 査読

89 被引用数 (Scopus)

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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 g_ee<(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.

本文言語	English
論文番号	021601
ジャーナル	Physical Review C - Nuclear Physics
巻	86
号	2
DOI	https://doi.org/10.1103/PhysRevC.86.021601
出版ステータス	Published - 2012 8月 6

ASJC Scopus subject areas

核物理学および高エネルギー物理学

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10.1103/PhysRevC.86.021601

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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., ... 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), [021601]. https://doi.org/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 2012, 'Limits on Majoron-emitting double-β decays of 136Xe in the KamLAND-Zen experiment', Physical Review C - Nuclear Physics, vol. 86, no. 2, 021601. https://doi.org/10.1103/PhysRevC.86.021601

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abstract = "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.",

author = "A. Gando and Y. Gando and H. Hanakago and H. Ikeda and K. Inoue and R. Kato and M. Koga and S. Matsuda and T. Mitsui and T. Nakada and K. Nakamura and A. Obata and A. Oki and Y. Ono and I. Shimizu and J. Shirai and A. Suzuki and Y. Takemoto and K. Tamae and K. Ueshima and H. Watanabe and Xu, {B. D.} and S. Yamada and H. Yoshida and A. Kozlov and S. Yoshida and Banks, {T. I.} and Detwiler, {J. A.} and Freedman, {S. J.} and Fujikawa, {B. K.} and K. Han and T. O'Donnell and Berger, {B. E.} and Y. Efremenko and Karwowski, {H. J.} and Markoff, {D. M.} and W. Tornow and S. Enomoto and Decowski, {M. P.}",

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AU - Gando, A.

AU - Gando, Y.

AU - Hanakago, H.

AU - Ikeda, H.

AU - Inoue, K.

AU - Kato, R.

AU - Koga, M.

AU - Matsuda, S.

AU - Mitsui, T.

AU - Nakada, T.

AU - Nakamura, K.

AU - Obata, A.

AU - Oki, A.

AU - Ono, Y.

AU - Shimizu, I.

AU - Shirai, J.

AU - Suzuki, A.

AU - Takemoto, Y.

AU - Tamae, K.

AU - Ueshima, K.

AU - Watanabe, H.

AU - Xu, B. D.

AU - Yamada, S.

AU - Yoshida, H.

AU - Kozlov, A.

AU - Yoshida, S.

AU - Banks, T. I.

AU - Detwiler, J. A.

AU - Freedman, S. J.

AU - Fujikawa, B. K.

AU - Han, K.

AU - O'Donnell, T.

AU - Berger, B. E.

AU - Efremenko, Y.

AU - Karwowski, H. J.

AU - Markoff, D. M.

AU - Tornow, W.

AU - Enomoto, S.

AU - Decowski, M. P.

PY - 2012/8/6

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N2 - 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.

AB - 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.

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

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