Key points are not available for this paper at this time.
KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with 136 Xe based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic 110m Ag background peak identified in previous searches is reduced by more than a factor of 10. By combining the KamLAND-Zen pre-and postpurification data, we obtain a preliminary lower limit on the 0 decay half-life of T 0 1/2 > 2.6 10 25 yr at 90% C.L. The search sensitivity will be enhanced with additional low background data after the purification. Prospects for further improvements with future KamLAND-Zen upgrades are also presented.
Asakura et al. (Thu,) studied this question.