Scintillation Balloon for Neutrinoless Double-Beta Decay Search with Liquid Scintillator Detectors

Abstract

Environmental radioactivity is a dominant background for rare decay search experiments, and it is difficult to completely remove such an impurity from detector vessels. We propose a scintillation balloon as the active vessel of a liquid scintillator in order to identify this undesirable radioactivity. According to our feasibility studies, the scintillation balloon enables the bismuth--polonium sequential decay to be tagged with a 99.7\% efficiency, assuming a KamLAND (Kamioka Liquid scintillator AntiNeutrino Detector)-type liquid scintillator detector. This tagging of sequential decay using alpha-ray from the polonium improves the sensitivity to neutrinoless double-beta decay with rejecting beta-ray background from the bismuth.

arXiv comment11 pages, 9 figures

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• Limits on astrophysical antineutrinos with the KamLAND experiment
• Development of a low-background HPGe detector at Kamioka Observatory
• Dark matter and low scale leptogenesis in a flavor symmetric neutrino two Higgs doublet model($\nu$2HDM)
• Development of a method to measure trace level of uranium and thorium in scintillation films