Abstract
KamLAND-Zen is an experiment for neutrinoless double beta decay (0ν2β) search with 136Xe, based on the large liquid scintillator detector KamLAND. KamLAND-Zen includes 16.5m3 xenon loaded liquid scintillator in a 3.16m diameter nylon balloon (inner-balloon) with 25μm wall thickness.KamLAND-Zen 400 (383kg 136Xe used) released a lower limit on the 0ν2β half-life of 136Xe. However, the sensitivity is limited by the contamination of radioactive backgrounds from the inner-balloon. Then, we planned KamLAND-Zen 800, upgrading the detector with a new inner-balloon of 3.84m diameter with 800kg 136Xe and 31.4m3 liquid scintillator.We present the current status of KamLAND-Zen, the new mini-balloon construction and methods to avoid background contaminations. In addition, the development of a scintillating balloon for future upgrades in order to remove the radioactive decay chain daughter nuclei bismuth is also introduced.
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