Status of balloon production for KamLAND-Zen 800 kg phase

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Published
2017-02
Resource Type
journal article
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  • https://www.elsevier.com/tdm/userlicense/1.0/
  • https://www.elsevier.com/legal/tdmrep-license
  • http://www.elsevier.com/open-access/userlicense/1.0/
  • https://doi.org/10.15223/policy-017
  • https://doi.org/10.15223/policy-037
  • https://doi.org/10.15223/policy-012
  • https://doi.org/10.15223/policy-029
  • https://doi.org/10.15223/policy-004
DOI
  • 10.1016/j.nima.2016.06.059
Publisher
Elsevier BV

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Abstract KamLAND-Zen is an experiment for neutrinoless double beta decay ( 0 ν 2 β ) search with 136 Xe, 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 0 ν 2 β 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.

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