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2022 Fiscal Year Final Research Report

Development of C/H ratio online detector for proton radius measurement by low-energy electraon scattering

Research Project

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Project/Area Number 20H01925
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 InstitutionTohoku University

Principal Investigator

Honda Yuki  東北大学, 電子光理学研究センター, 助教 (70807685)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywords原子核物理 / 陽子半径 / 検出器
Outline of Final Research Achievements

Proton charge radius measurement by low-energy electron scattering is ongoing at Research Center for Electron Photon Science, Tohoku university. The experiment use a polyethylene (CH2) target to perform simultaneous measurement of the e+H and e+C elastic scatterings. To determine a e+H cross section, target number ration of H and C plays very important roll, but the ratio changes during the experiment due to hydrogen knockout by the electron beam. We developed a online monitor of the target ratio with 0.1 % accuracy.
We performed commissioning of the new ULQ2 beam line and electron-magnetic spectrometer to investigate the required performance of the online monitor. Finally, we decide to adopt 3 layer of single-side silicon strip detector as the online monitor, and manufactured that.

Free Research Field

原子核物理

Academic Significance and Societal Importance of the Research Achievements

陽子は原子核を構成する基本要素の一つであり、その電荷半径は陽子の基本的な物理パラメーのひとつであり、物理的に重要な値である。ELPH で行う電子散乱による陽子電荷半径測定は低エネルギー電子散乱によって初めて可能な研究であり、現時点では東北大電子光理学研究センターの低エネルギー電子ビームラインでのみ実行が可能である。モデル依存性を可能な限り排除し、電子散乱としては最も信用できる陽子電荷半径を決定することができるため、世界的に見ても重要な実験である。本研究で物理実験を開始できる段階まで進む準備が整った。

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Published: 2024-01-30  

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