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2021 Fiscal Year Final Research Report

Study of the history of the Universe using high-light-yield scintillators

Research Project

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Project/Area Number 18H01222
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionUniversity of Tsukuba

Principal Investigator

Iida Takashi  筑波大学, 数理物質系, 助教 (40722905)

Co-Investigator(Kenkyū-buntansha) 小川 泉  福井大学, 学術研究院工学系部門, 准教授 (20294142)
吉野 将生  東北大学, 金属材料研究所, 助教 (30789938)
鎌田 圭  東北大学, 未来科学技術共同研究センター, 准教授 (60639649)
Project Period (FY) 2018-04-01 – 2021-03-31
Keywordsニュートリノ / 暗黒物質 / 無機シンチレータ
Outline of Final Research Achievements

We have developed a calcium iodide (CaI2 ) scintillator and aim to launch the sensitive dark matter search and double beta decay search experiment using it in the future. In order to increase the sensitivity of experiments, three pillars are generally important: low threshold and high resolution, large size, and low background (BG). We have succeeded in producing CaI2 crystals with a luminous intensity 2.7 times higher than that of NaI(Tl), demonstrating that low threshold and high resolution can be achieved. As for the larger size crystal, a dedicated CaI2 furnace was set up, and 2-inch size crystals were developed. We also conducted basic research on low BG technology using waveform discrimination method, and demonstrated very high particle discrimination ability of CaI2.

Free Research Field

素粒子物理学実験

Academic Significance and Societal Importance of the Research Achievements

本研究では、暗黒物質探索や二重ベータ崩壊研究といった基礎物理の研究に利用可能な大発光量のCaI2シンチレータ開発に取り組んだ。これらの研究を行うためには、低閾値・高分解能、大型、 低バックグラウンドの検出器が必要となる。本研究により、大型結晶の育成と低バックグラウンド技術の確立に成功した。この新たなシンチレータは、我々の目指す基礎物理実験のみならず、エネルギーや医療といった実用的な分野でも利用できる可能性がある。

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Published: 2023-01-30  

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