Development of scintillating bolometer for next generation neutrino-less double beta decay search

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287045
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: Yoshida Sei 大阪大学, 理学研究科, 准教授 (60400230)
• Co-Investigator(Renkei-kenkyūsha): Ogawa Izumi 福井大学, 大学院工学研究科, 准教授 (20294142) ; Kishimoto Tadafumi 大阪大学, 大学院理学研究科, 教授 (90134808) ; Miuchi Kentaro 神戸大学, 大学院理学研究科, 准教授 (80362440) ; Umehara Saori 大阪大学, 核物理研究センター, 准教授 (10379282) ; Iida Takashi 筑波大学, 数理物質系, 助教 (40722905) ; Nakajima Kyouhei 福井大学, 大学院工学研究科, 講師 (30722540)
• Research Collaborator: Kim Yong-Ham 韓国IBS研究所, 教授 ; Tetsuno Kounosuke 大阪大学, 大学院理学研究科, 大学院生 ; Lee Xiaolon 大阪大学, 大学院理学研究科, 大学院生
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 二重ベータ崩壊 / ニュートリノ質量 / マヨラナニュートリノ / ボロメーター / シンチレーション検出器 / フッ化カルシウム結晶

Outline of Final Research Achievements

In this research, we developed a high energy resolution detector which is very important for neutrino-less double beta decay search. The scintillating bolometer with undoped calcium fluoride scintillation crystal containing 48Ca isotope, which has the highest Q value among double beta decay isotopes, was used. The crystal was cooled down to an extremely low temperature of 10 mK. We developed a method to simultaneously detect scintillation light in addition to heat quantity. Compare the signal intensities of both light and heat, types of particles can be identified.
It was succeeded for the first time to realize the scintillating bolometer detector using the undoped calcium fluoride crystals during the research period. This achievement is an important step toward future high-sensitivity, large-scale neutrino-less double beta decay study using 48Ca isotope.

Free Research Field

素粒子原子核実験