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

KamLAND-Zen Collaboration

Research output: Contribution to conferencePaperpeer-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 T1/2 = 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 T1/2 > 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 languageEnglish
Pages359-364
Number of pages6
Publication statusPublished - 2012
Event47th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2012 - La Thuile, Italy
Duration: 2012 Mar 32012 Mar 10

Conference

Conference47th Rencontres de Moriond on Electroweak Interactions and Unified Theories, EW 2012
CountryItaly
CityLa Thuile
Period12/3/312/3/10

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Atomic and Molecular Physics, and Optics

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