Results from KamLAND-Zen

Research output: Contribution to conferencePaperpeer-review

Abstract

We present results of the KamLAND-Zen experiment, measurement of 136Xe double-beta decay with xenon loaded liquid scintillator. Based on an exposure of 112.3 days with 125 kg of 136Xe, two-neutrino double-beta decay half-life is measured precisely to be T1/2 = 2.30 ± 0.02(stat) ± 0.12(syst) · 1021 yr. For the neutrino-less double-beta decay, no signal has been observed. A lower limit of half-life is set to T1/2 > 6.2 · 1024 yr at 90 % C.L. and the corresponding upper limit of the effective neutrino mass is ranged to (0.26-0.54) eV depending on the adopted nuclear matrix elements. Half-lives of Majoron-emitting neutrino-less double-beta decay with spectral index n = 1, 2, 3 and 7 are also estimated. As for "ordinary" decay (n = 1), we have obtained lower limit of half-life, T1/2 > 2.7 · 1024 yr at 90 % C.L., corresponding to the upper limit of the effective Majoron-emitting coupling, ≤gee≥ < (0.8 - 1.6) · 10-5 (90 % C.L.). This result is the most stringent limit on <g ee> for all double-beta decay nuclei and excludes a previously unconstrained region of this parameter.

Original languageEnglish
Pages386-389
Number of pages4
Publication statusPublished - 2013 Jan 1
Event4th International Conference on Current Problems in Nuclear Physics and Atomic Energy, NPAE 2012 - Kyiv, Ukraine
Duration: 2012 Sep 32012 Sep 7

Conference

Conference4th International Conference on Current Problems in Nuclear Physics and Atomic Energy, NPAE 2012
CountryUkraine
CityKyiv
Period12/9/312/9/7

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

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