Scintillation balloon for liquid scintillator base Neutrinoless double beta decay search experiments

S. Obara, Y. Gando, K. Ishidoshihro

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


A liquid scintillator base experiment KamLAND-Zen has set a lower limit on neutrinoless double beta decay half-life, and upgrade project KamLAND-Zen 800 has started in 2019. Unfortunately this project expects some backgrounds, and one of the main backgrounds is β/γ-ray from 214Bi in container of xenon loaded liquid scintillator (mini-balloon). In order to reject the background, we suggest using scintillation film for the future mini-balloon. If we can tag α-ray from 214Po by scintillation detection, we can eliminate 214Bi events by delayed coincidence analysis. Recently, it was reported that polyethylene naphthalate (PEN) can be used as a scintillator with blue photon emission. PEN has chemical compatibility for strong solvent, thus it has a possibility to use in liquid scintillator. In this presentation, we will mention the results for feasibility studies about transparency and emission spectra, light yield, radioactivity, strength of film etc.. We also show the test-sized scintillation balloon with an 800-mm diameter and discussions about how to use the scintillation balloon in KamLAND.

Original languageEnglish
Article number012136
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2020 Mar 20
Externally publishedYes
Event16th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2019 - Toyama, Japan
Duration: 2019 Sep 92019 Sep 13

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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