Status of balloon production for KamLAND-Zen 800 kg phase

For the KamLAND-Zen Collaboration

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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 16.5 m3 xenon loaded liquid scintillator in a 3.16 m diameter nylon balloon (inner-balloon) with 25 μm wall thickness. KamLAND-Zen 400 (383 kg 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 3.84 m diameter with 800 kg 136Xe and 31.4 m3 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.

Original languageEnglish
Pages (from-to)410-413
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2017 Feb 11


  • Double beta decay
  • Majorana neutrino
  • PolyEthylene Naphthalate

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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