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ZICOS - A new project for neutrinoless double beta decay using Zirconium complex in organic liquid scintillator
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fukuda, Yukihide Kamei, Yutaro Narengerile Obata, Akira Moriyama, Satoshi Ogawa, Izumi Gunji, Takahiro Hayami, Ryohei Tsukada, Satoru |
| Copyright Year | 2020 |
| Abstract | A liquid scintillator containing Zr has been developed for ZICOS experiment. We will use 180 tons of liquid scintillator with 64 % photo coverage of 20 inch photomultiplier. In order to reach the sensitivity T 0ν 1/2 ≥ 10 years, we have to achieve 50 % enrichment of Zr and reduce 95 % of Tl decay backgrounds. Using Monte Carlo simulation, we could reduce 93 % of Tl background with 78 % efficiency for 0νββ signal using difference of Cherenkov hit pattern. For the separation of Cherenkov and scintillation signals, we measured the timing pulse shape of Zr loaded liquid scintillator using FADC digitizer, and we found an inconsistent pulse shape at the rising time with the template of scintillation. Also the event rate with an inconsistent pulse shape seems to have a directionality. 1. ZICOS experiment We have proposed a new experiment for neutrinoless double beta decay (0νββ) search using nucleus 96Zr [1]. A 96Zr has third highest Q-value (3.35 MeV) among possible 0νββ isotopes, therefore, in general, some radioactive backgrounds such as 214Bi in Uranium series and 10C, which is spallation product of the energetic cosmic muon, could be avoidable due to their lower energy. We will use total 180 tons of liquid scintillator containing 10 wt.% concentration of a tetrakis (isopropyl acetoacetato) zirconium (Zr(iPrac)4), which corresponds to 72 kg (45 kg in fiducial volume) of 96Zr assuming 2.6 % natural abundance, inside of the balloon. The inner balloon (3.5 m in radius) is located in the spherical detector (4.0 m in radius) which has 64 % of photo coverage of 20 inch photomultiplier (PMT) as shown in Fig.1. The outside of the inner balloon will be filled with pure water which has almost same density as Anisole. This is very important for reducing backgrounds due to 208Tl decay which may adhere to the surface of inner balloon as described later. The energy resolution is expected to 2.6 % at 3.35 MeV[2]. |
| Starting Page | 012093 |
| Ending Page | 012093 |
| Page Count | 1 |
| File Format | PDF HTM / HTML |
| DOI | 10.1088/1742-6596/1342/1/012093 |
| Alternate Webpage(s) | http://masamune.miyakyo-u.ac.jp/gakkai/taup2017-fukuda.pdf |
| Alternate Webpage(s) | https://doi.org/10.1088/1742-6596%2F1342%2F1%2F012093 |
| Volume Number | 1342 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
