The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment

Abstract

The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of ${}^{136}$Xe by using ${}^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spallation products and ${}^8$B solar neutrinos. Indeed these events could contribute to the total counts in the region of interest around the Q-value of the double-beta decay of ${}^{136}$Xe. In this paper, we present an overview of the IB and describe the various steps of its commissioning minimizing the radioactive contaminations, from the material selection, to the fabrication of the balloon and its installation inside the KamLAND detector. Finally, we show the impact of the IB on the KamLAND background as measured by the KamLAND detector itself.

arXiv comment23 pages, 16 figures, to be submitted to JINST

References in corpus (8)

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• Review of Novel Approaches to Organic Liquid Scintillators in Neutrino Physics
• Theoretical and Experimental Challenges in the Measurement of Neutrino Mass
• Search for supernova neutrinos and constraint on the galactic star formation rate with the KamLAND data
• BINGO innovative assembly for background reduction in bolometric $0\nu \beta \beta$ experiments
• A search for correlated low-energy electron antineutrinos in KamLAND with gamma-ray bursts
• KamLAND's search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube