ZICOS - New project for neutrinoless double beta decay experiment using zirconium complex in liquid scintillator

14th International Conference on Topics in Astroparticle and Underground Physics

物理学;天文学

Fukuda, Yoshiyuki^1

Department of Physics, Faculty of Education, Miyagi University of Education, Miyagi, Sendai

980-0845, Japan^1

关键词: Cherenkov light;    Energy resolutions;    High solubility;    Inner Detector;    Liquid scintillator;    Neutrinoless double-beta decays;    New projects;    Zirconium complexes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/718/6/062019/pdf
DOI  :  10.1088/1742-6596/718/6/062019

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

A liquid scintillator containing a tetrakis (isopropyl acetoacetato) zirconium has been developed for new project of neutrinoless double beta decay experiment (ZICOS experiment). We have synthesized a tetrakis (isopropyl acetoacetato) zirconium, which have high solubility (over 31.2 wt.%) in anisole. We measured the performance of liquid scintillator containing 10 wt.% concentration of a tetrakis (isopropyl acetoacetato) zirconium, and obtained 48.7 ± 7.1% of the light yield of BC505 and the energy resolution of 4.1 ± 0.6% at 3.35 MeV assuming 40% photo coverage of the photomultiplier, respectively. We also estimated that ZICOS experiment should be sensitive to (mν) pp= 1.11 and QRPA model, if a radius of the inner detector is 1.5 m and the detector is filled with this liquid scintillator with an enriched96Zr nucleus and we can reduce208Tl backgrounds to be one tenth order of magnitude of KamLAND-Zen using Cherenkov lights.