Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

KamLAND-Zen Collaboration

研究成果: Article査読

637 被引用数 (Scopus)

抄録

We present an improved search for neutrinoless double-beta (0νββ) decay of Xe136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T1/20ν>1.07×1026 yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.

本文言語English
論文番号082503
ジャーナルPhysical review letters
117
8
DOI
出版ステータスPublished - 2016 8 16

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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