ZICOS - Neutrinoless Double Beta Decay experiment using Zr-96 with an organic liquid scintillator -

被引：0

作者：

Fukuda, Yoshiyuki ^{[1
]}

Moriyama, Shigetaka ^{[2
]}

Hiraide, Katsuki ^{[2
]}

Ogawa, Izumi ^{[3
]}

Gunji, Takahiro ^{[4
]}

Hayami, Ryohei ^{[4
]}

Tsukada, Satoru ^{[4
]}

Kurosawa, Shunsuke ^{[5
]}

机构：

[1] Miyagi Univ Educ, Dept Phys, Fac Educ, Sendai, Miyagi, Japan

[2] Univ Tokyo, Inst Cosm Ray Res, Kamioka Observ, Gifu, Japan

[3] Univ Fukui, Dept Appl Phys, Fac Engn, Fukui, Japan

[4] Tokyo Sci Univ, Fac Sci & Technol, Dept Pure & Appl Chem, Tokyo, Japan

[5] Tohoku Univ, Inst Mat Res, Sendai, Miyagi, Japan

来源：

EUROPEAN PHYSICAL SOCIETY CONFERENCE ON HIGH ENERGY PHYSICS, EPS-HEP2019 | 2020年

关键词：

D O I：

暂无

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A liquid scintillator containing a tetrakis (isopropyl acetoacetato) zirconium has been developed for ZICOS experiment. In order to reach the sensitivity T-1/2(0v) >= 10(27) years, we have to use tone scale of Zr-96 and have to reduce 95 % of Tl-208 decay background. Using Monte Carlo simulation, we could demonstrate new method using the topological information of Cherenkov light, and could reduce 93 % of Tl-208 background with 78 % efficiency for 0n beta beta signal. For the discrimination of Cherenkov light, the precise spectral pulse shape from Cherenkov lights was directly measured by using sub-MeV electrons from Sr-90/Y-90 beta source. The observed shape was clearly different from the shape of scintillation light. The pulse rise and fall (decay) time for Cherenkov light were 0.8 ns and 2.5 ns, respectively. They were actually shorter than those times of scintillation light which were also measured by 1.6 ns and 6.5 ns, respectively. This clear difference of rise time will be used for the pulse shape discrimination in order to select PMT which receive Cherenkov lights, and the topological information due to Cherenkov light will be used for the reduction of backgrounds from Tl-208 decay which should be major backgrounds observed around Q-value (3.35MeV) of Zr-96 neutrinoless double beta decay.

引用

页数：4

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