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

Research Project

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
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
Fiscal Year 2020: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords原子核物理 / 陽子半径 / 検出器 / 電子散乱 / 原子核
Outline of Research at the Start

電子とミューオンで測定された陽子荷電半径が4%(7標準偏差)も異なるという結果が2010年に報告された。これは、標準模型のレプトン普遍性の破れの可能性を示唆しており、大きな注目を浴びた。その重要さから様々な検証が行われ、過去の電子散乱による陽子半径測定にはモデル依存性が指摘されるようになった。本研究では極限までモデル依存性を排除した、電子散乱による陽子半径測定を行う。これは低エネルギー電子散乱によってのみ可能な研究であり、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。この研究に向けたCH2 標的中の陽子/炭素比のオンライン測定器の開発が目的である。

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.

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。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (17 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Study of radii of proton and nuclei by electron scattering2022

    • Author(s)
      T. Suda
    • Journal Title

      JAEA-Conf

      Volume: 2022-001 Pages: 51-56

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Proton Charge Radius2021

    • Author(s)
      T. Suda, Y. Honda, D. Taki et al.
    • Journal Title

      Genshikaku Kenkyuu

      Volume: 66 Pages: 1-11

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Proton Charge Radius2021

    • Author(s)
      T. Suda, Y. Honda, Y. Maeda, and K. Tsukada
    • Journal Title

      High-Energy News

      Volume: 40 Pages: 107-116

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam2020

    • Author(s)
      Aoyagi T.、Honda Y.、Ikeda H.、Ikeno M.、Kawagoe K.、Kohriki T.、Kume T.、Mibe T.、Namba K.、Nishimura S.、Saito N.、Sasaki O.、Sato N.、Sato Y.、Sendai H.、Shimomura K.、Shirabe S.、Shoji M.、Suda T.、Suehara T.、Takatomi T.、Tanaka M.、Tojo J.、Tsukada K.、Uchida T.、Ushizawa T.、Wauke H.、Yamanaka T.、Yoshioka T.
    • Journal Title

      Journal of Instrumentation

      Volume: 15 Issue: 04 Pages: P04027-P04027

    • DOI

      10.1088/1748-0221/15/04/p04027

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Current Status of the ULQ2 Experiment2022

    • Author(s)
      Yuki Honda
    • Organizer
      PREN2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ELPHでの低エネルギー電子散乱による陽子半径測定2022

    • Author(s)
      本多佑記
    • Organizer
      ELPH symposium 2023
    • Related Report
      2022 Annual Research Report
  • [Presentation] Current Status of ULQ2 Experiment:Proton Radius Measurement with Low-energy Electron Scattering2022

    • Author(s)
      Yuki Honda
    • Organizer
      HADRON2021
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current status of ULQ2 experiment: Proton radius measurement with low-energy electrons scattering.2021

    • Author(s)
      Yuki Honda
    • Organizer
      19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman
    • Related Report
      2021 Annual Research Report
  • [Presentation] First test results for the ULQ2 experiment towards the proton charge radius determination2021

    • Author(s)
      Clement Legris
    • Organizer
      JPS 2021 Autumn Meeting,
    • Related Report
      2021 Annual Research Report
  • [Presentation] Study of radii of proton and exotic nuclei by electron scattering.2021

    • Author(s)
      Toshimi Suda
    • Organizer
      2021 Symposium on Nuclear Data,
    • Related Report
      2021 Annual Research Report
  • [Presentation] Commissioning of the twin spectrometers for the proton charge radius measurement by low-energy electron scattering.2021

    • Author(s)
      Clement Legris
    • Organizer
      International School for Strangeness Nuclear Physics 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Proton radius measurement with low-energy electron scattering at ELPH2021

    • Author(s)
      Yuki Honda
    • Organizer
      The 8th Asia-Pacific Conference on Few-Body Problems in Physics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 陽子半径2021

    • Author(s)
      須田利美
    • Organizer
      日本のスピン物理の展望
    • Related Report
      2020 Annual Research Report
  • [Presentation] 陽子半径パズルの解明に向けた極低エネルギー電子・陽子散乱実験2021

    • Author(s)
      本多佑記
    • Organizer
      ELPH Symposium 2021
    • Related Report
      2020 Annual Research Report
  • [Presentation] ELPHでの低エネルギー電子散乱による陽子電荷半径の精密測定2021

    • Author(s)
      本多佑記
    • Organizer
      ELPH研究会C028
    • Related Report
      2020 Annual Research Report
  • [Presentation] 東北大ELPHでの低エネルギー電子散乱による陽子半径測定2021

    • Author(s)
      本多佑記
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 低エネルギー電子散乱による陽子半径測定のためのスペクトロメータの性能評価2021

    • Author(s)
      瀧大祐
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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