Systematic experiments for influence of methyl radical and hydrogen bond on neutron slowing down and scattering data derivation

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K05339
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 31010:Nuclear engineering-related
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Harada Masahide 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 J－PARCセンター, 研究主幹 (50354733)
• Co-Investigator(Kenkyū-buntansha): 安部 豊 京都大学, 工学研究科, 助教 (80378794)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: メチル基 / 水素結合 / 中性子の減速 / 系統的実験 / 散乱データ

Outline of Final Research Achievements

The purpose of this study was to obtain neutron transmission and scattering data for hydrogen-containing materials with methyl groups or hydrogen bonds systematically and to clarify the effects on neutron slowing-down processes. Firstly, sample cells were fabricated for the measurement, including a special sample cell handling samples that are gas state at room temperature and liquid or solid state at cryogenic temperatures. In the experiments, neutron transmission and scattering data of light water, heavy water, methanol, ethanol, benzene, toluene, xylene, methane, and hydrogen were measured in the temperature range from 20 K to 300 K on the neutron instruments (NOBORU and AMATERAS) at J-PARC. The measurement results show that material differences are not visible in the total cross sections but are clearly observed in the scattering data.

Free Research Field

原子力工学

Academic Significance and Societal Importance of the Research Achievements

本研究では、20K～300Kの温度領域で、軽水、重水、メタノール、エタノール、ベンゼン、トルエン、キシレン、メタン、水素の中性子透過・散乱データを系統的に取得でき、打全断面積や二重微分断面積への変換を行うことができた。旧来のデータでは不十分だったこれらのデータを系統的に取得することができ、核データ分野のみならず、含有水素物質が重要となる中性子源開発、研究原子炉開発への波及が期待できる。また、理論計算の改良への大きな道筋をつけることが可能となる。