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

TL;DR

This paper reports an improved search for neutrinoless double-beta decay of $^{136}$Xe using KamLAND-Zen, setting new lower limits on decay half-life and constraining the effective Majorana neutrino mass near the inverted hierarchy region.

Contribution

The study achieved a significant reduction of background contaminants and improved the half-life limit by nearly six times compared to previous results.

Findings

Lower limit for decay half-life: >1.07 x 10^{26} years

Effective Majorana neutrino mass constrained to 61-165 meV

Limits reach the bottom of the quasi-degenerate neutrino mass region

Abstract

We present an improved search for neutrinoless double-beta ($0\nu\beta\beta$) decay of $^{136}$Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the $^{110m}$Ag 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 $T_{1/2}^{0\nu} > 1.07 \times 10^{26}$ 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 quasi-degenerate neutrino mass region.