Scintillation balloon for liquid scintillator base Neutrinoless double beta decay search experiments. (February 2020)

• Record Type: Journal Article
• Authors: Obara, S; Gando, Y; Ishidoshihro, K
• Is Part Of: Journal of physics. Volume 1468(2020)
• Publication Date: 2020-02
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1468/1/012136
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: 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 214 Bi 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 214 Po by scintillation detection, we can eliminate 214 Bi 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.