Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.082503
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Funding
- JSPS KAKENHI [21000001, 26104002]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Stichting FOM in the Netherlands
- U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
- DOE grant
- NSF grant
- NII for SINET4
- Grants-in-Aid for Scientific Research [16H00859, 15H01027, 15K17635, 15K13472, 15J02193, 26104002, 15H03649, 21000001] Funding Source: KAKEN
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We present an improved search for neutrinoless double-beta (0 nu beta beta) decay of Xe-136 in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the Ag-110m contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0 nu beta beta decay half-life of T-1/2(0 nu) > 1.07 x 10(26) 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.
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