[22p-F308-1~13] 2.1 Detection Devices

[22p-F308-4] Study of pulse shape discrimination in GAGG, HR-GAGG, and GFAG Scintillators

〇Masao Yoshino^1,3, Takashi Iida⁴, Kei Kamada^2,3, Ken-ichi Fushimi⁵, Keishi Hosokawa⁶, Kyohei Nakajima⁷, Nobuo Hinohara⁴, Keita Mizukoshi⁸, Akira Yoshikawa^1,2,3 (1.Tohoku Univ. IMR, 2.Tohoku Univ. NICHe, 3.C&A Corp., 4.Tsukuba Univ., 5.Tokushima Univ., 6.The Univ. of Tokyo, 7.Fukui Univ., 8.Kobe Univ.)

Keywords:scintillator, 160Gd, Pulse shape discrimination

In the search for double beta decay of ¹⁶⁰Gd, the world's most sensitive experiment was performed in Ukraine in 2001 using Gd₂SiO₅ (GSO) scintillator. However, the sensitivity is limited by the presence of a large amount of alpha rays due to internal radioactive impurities as background. Our research group has been working on the Gd₃Ga₃Al₂O₁₂:Ce (GAGG) scintillator, which has been reported to have excellent pulse shape discrimination (PSD) capability. C&A's GAGG series includes HR-GAGG, which achieves high energy resolution by controlling the Ga/Al ratio, and GFAG, which achieves fast decay time by adding a small amount of Mg. In this study, we report a comparison of the PSD performance of these scintillators.