Limits on Majoron-emitting double-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>decays of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>136</mml:mn></mml:msup></mml:math>Xe in the KamLAND-Zen experiment

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Bibliographic Information

Published
2012-08-06
Resource Type
journal article
Rights Information
  • http://link.aps.org/licenses/aps-default-license
  • http://link.aps.org/licenses/aps-default-accepted-manuscript-license
DOI
  • 10.1103/physrevc.86.021601
Publisher
American Physical Society (APS)

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Description

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 T0νχ01/2>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.

Journal

  • Physical Review C

    Physical Review C 86 (2), 021601-, 2012-08-06

    American Physical Society (APS)

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