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Kamei, Y.; Shimizu, I.; Teraoka, Y.; Yamamura, T.; Shirasaki, K.
Journal of instrumentation, 08/2023, Volume: 18, Issue: 8Journal Article
Abstract Development of radio-purification for the large-volume liquid scintillator detector is a key to enhance search sensitivities in neutrino physics. In this paper, we describe laboratory studies on the radio-purification of the liquid scintillator detector by using the metal scavenger, aiming at the improved search for the neutrinoless double beta decay in KamLAND-Zen. In the purification tests, the 210 Pb reduction efficiency was evaluated. Based on the purification performance in small-scale system, we designed a large adsorption column for the metal scavenging applicable to the KamLAND purification system. We produced the column and constructed a purification test bench, and confirmed the 212 Pb reduction efficiency, the process speed, the LS contamination and quality changes, and the stability of chemical components in the Xe-LS. We found that the metal scavenging is a practical method for the large-volume LS purification, and will be effective to reduce metallic radioactive elements.
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