First result from KamLAND-Zen Double Beta Decay with 136Xe

KamLAND-Zen Collaboration

First result from KamLAND-Zen Double Beta Decay with ¹³⁶Xe

KamLAND-Zen Collaboration

Research Center for Neutrino Science (RCNS)

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

We present the first result of the KamLAND-Zen experiment, measurement of ¹³⁶Xe doublebeta decay. In an exposure of 77.6 days with 129 kg of ¹³⁶Xe, two-neutrino double-beta decay half-life is measured precisely to be T^2ν_1/2 = 2:38±0:02(stat)±0:14(syst)×10²¹ yr. This value is consistent with the measurement by EXO-200 and significantly below the lower limit obtained by previous experiment. For the neutrinoless double-beta decay half-life, improved lower limit is set to T^0ν_1/2 > 5.7 × 10²⁴ yr at 90% C.L. and corresponding upper limit of the effective neutrino mass is ranged to 0.3-0.6 eV depending on the adopted nuclear matrix elements.

Original language	English
Pages	359-364
Number of pages	6
Publication status	Published - 2012
Event	47th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2012 - La Thuile, Italy Duration: 2012 Mar 3 → 2012 Mar 10

Conference

Conference	47th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2012
Country	Italy
City	La Thuile
Period	12/3/3 → 12/3/10

ASJC Scopus subject areas

Astronomy and Astrophysics
Atomic and Molecular Physics, and Optics

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Cite this

@conference{62c0d5de90d04758a910d9d36348f06f,

title = "First result from KamLAND-Zen Double Beta Decay with 136Xe",

abstract = "We present the first result of the KamLAND-Zen experiment, measurement of 136Xe doublebeta decay. In an exposure of 77.6 days with 129 kg of 136Xe, two-neutrino double-beta decay half-life is measured precisely to be T2ν1/2 = 2:38±0:02(stat)±0:14(syst)×1021 yr. This value is consistent with the measurement by EXO-200 and significantly below the lower limit obtained by previous experiment. For the neutrinoless double-beta decay half-life, improved lower limit is set to T0ν1/2 > 5.7 × 1024 yr at 90% C.L. and corresponding upper limit of the effective neutrino mass is ranged to 0.3-0.6 eV depending on the adopted nuclear matrix elements.",

author = "{KamLAND-Zen Collaboration} and A. Gando",

note = "Funding Information: Talk and this manuscript is based on the paper11. The KamLAND-Zen experiment is supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and the US Department of Energy (DOE). The Kamioka Mining and Smelting Company has provided service for activities in the mine.; 47th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2012 ; Conference date: 03-03-2012 Through 10-03-2012",

year = "2012",

language = "English",

pages = "359--364",

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T1 - First result from KamLAND-Zen Double Beta Decay with 136Xe

AU - KamLAND-Zen Collaboration

AU - Gando, A.

N1 - Funding Information: Talk and this manuscript is based on the paper11. The KamLAND-Zen experiment is supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and the US Department of Energy (DOE). The Kamioka Mining and Smelting Company has provided service for activities in the mine.

PY - 2012

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N2 - We present the first result of the KamLAND-Zen experiment, measurement of 136Xe doublebeta decay. In an exposure of 77.6 days with 129 kg of 136Xe, two-neutrino double-beta decay half-life is measured precisely to be T2ν1/2 = 2:38±0:02(stat)±0:14(syst)×1021 yr. This value is consistent with the measurement by EXO-200 and significantly below the lower limit obtained by previous experiment. For the neutrinoless double-beta decay half-life, improved lower limit is set to T0ν1/2 > 5.7 × 1024 yr at 90% C.L. and corresponding upper limit of the effective neutrino mass is ranged to 0.3-0.6 eV depending on the adopted nuclear matrix elements.

AB - We present the first result of the KamLAND-Zen experiment, measurement of 136Xe doublebeta decay. In an exposure of 77.6 days with 129 kg of 136Xe, two-neutrino double-beta decay half-life is measured precisely to be T2ν1/2 = 2:38±0:02(stat)±0:14(syst)×1021 yr. This value is consistent with the measurement by EXO-200 and significantly below the lower limit obtained by previous experiment. For the neutrinoless double-beta decay half-life, improved lower limit is set to T0ν1/2 > 5.7 × 1024 yr at 90% C.L. and corresponding upper limit of the effective neutrino mass is ranged to 0.3-0.6 eV depending on the adopted nuclear matrix elements.

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