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2023 Fiscal Year Final Research Report

Precise verification of galactic cosmic-ray propagation models by high-precision aerogel Cherenkov imaging

Research Project

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Project/Area Number 21K03584
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionChiba University

Principal Investigator

Tabata Makoto  千葉大学, 大学院理学研究院, 特任研究員 (10573280)

Project Period (FY) 2021-04-01 – 2024-03-31
Keywordsシリカエアロゲル / チェレンコフ輻射体 / リングイメージングチェレンコフ検出器 / 屈折率 / 透過率 / 宇宙線 / HELIX / 放射線検出器
Outline of Final Research Achievements

A new silica aerogel as a radiator has been developed to upgrade a Cherenkov detector, which will be installed in a long-term balloon orbiting polar regions and identifies direct cosmic charged nuclides outside the atmosphere. Cherenkov detectors need to yield more Cherenkov light emitted from aerogels to identify cosmic-ray nuclides accurately. Light propagation in aerogels strongly depends on their physical properties, such as refractive index and optical transparency. The most transparent hydrophobic aerogel to date, with a precisely controlled refractive index of 1.03, has been successfully produced, and essential research for employing the aerogel in the detector has been completed.

Free Research Field

素粒子実験

Academic Significance and Societal Importance of the Research Achievements

銀河系内における宇宙線の伝播機構は未だ完全には解明されておらず複数の理論モデルが提案されているが、観測データの不足によりモデルの正当性を評価できていない。高エネルギー領域においては宇宙線粒子の軽元素同位体存在比に対して各々の理論モデルが異なる予言を与え、その精密測定は伝播機構の解明への鍵となる。本研究で新たに開発した屈折率1.03のエアロゲルを実装したチェレンコフ検出器を用いて観測を進めることにより、理論モデルに強い制限を与えることができる。また、この屈折率のエアロゲルは汎用性が高く、様々なチェレンコフ検出器への応用が期待できる。

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Published: 2025-01-30  

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