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2018 Fiscal Year Annual Research Report

液体アルゴン三次元飛跡検出装置を用いた世界協力による物質優勢宇宙創成の謎への挑戦

Research Project

Project/Area Number 17H01134
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

長谷川 琢哉  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (40261549)

Project Period (FY) 2017-04-01 – 2022-03-31
Keywords液体アルゴン三次元飛跡検出装置 / 物質優勢宇宙創成の謎 / レプトンのCP対称性 / ニュートリノの質量階層性 / 陽子崩壊
Outline of Annual Research Achievements

物質優勢宇宙創成の謎への挑戦を行うため、巨大液体アルゴン三次元飛跡検出装置(LAr-TPC)を用いた Deep Underground Neutrino Experiment (DUNE)が始動した。DUNEでは 1)1,300km以上の長基線、2)水相当3,000m以上の大深度地下に設置される25kt以上のLAr-TPC、3)1MW以上の出力を持つ大強度陽子加速器により生成される大強度ニュートリノビーム、4)生成直後のニュートリノの素性を把握するための前置測定装置、5)加速器ビームによる性能実証機能・較正機能を備えた 1kt LAr-TPC、を用意し、長基線ニュートリノ研究(レプトンのCP対称性の破れの探索とニュートリノ質量階層性の決定)と陽子崩壊現象探索研究を行う。本研究では、1kt LAr-TPC の実現及び性能実証により、長基線ニュートリノ研究と陽子崩壊探索の信頼性をゆるぎなきものとすることを目的としている。これまでに、電離電子信号読み出し電極、電離電子信号用エレクトロニクス、光検出装置について、試作、最終仕様決定がなされ、各々、必要量の作成と個別性能確認が行われ、測定装置組み込み前統合試験を経て、1kt LAr-TPC への組み込みが行われた。組み込み後には、1kt LAr-TPC 全体システムの統合試験、宇宙線を使用した動作試験が開始されている。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

電離電子信号読み出し電極、電離電子信号用エレクトロニクス、光検出装置の必要量の作成と個別性能確認が行われ、測定装置組み込み前統合試験を経て、1kt LAr-TPC への組み込みが終了している。組み込み後には、1kt LAr-TPC 全体システムの統合試験、宇宙線を使用した動作試験が開始されている。

Strategy for Future Research Activity

1kt LAr-TPC測定装置を長期安定稼働するうえで不可欠な高電圧印加装置の放電不安定性除去を目的とした測定装置再調整を行なったうえで、宇宙線を使用した測定装置試運転を行う。年度全般を通して、加速器ビームによ る測定装置性能実証に備えて、計算機シミュレーション、実験データ解析環境の開発を行う。

  • Research Products

    (18 results)

All 2020 2019 Other

All Int'l Joint Research (6 results) Journal Article (10 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 10 results,  Open Access: 10 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Int'l Joint Research] Fermilab/BNL/SLAC(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      Fermilab/BNL/SLAC
    • # of Other Institutions
      80
  • [Int'l Joint Research] IPNL, Lyon/Saclay/APC, Paris(フランス)

    • Country Name
      FRANCE
    • Counterpart Institution
      IPNL, Lyon/Saclay/APC, Paris
    • # of Other Institutions
      3
  • [Int'l Joint Research] CERN/University of Bern/ETHZ(スイス)

    • Country Name
      SWITZERLAND
    • Counterpart Institution
      CERN/University of Bern/ETHZ
    • # of Other Institutions
      1
  • [Int'l Joint Research] University of Oxford/University of Cambridge/University of Manchester(英国)

    • Country Name
      UNITED KINGDOM
    • Counterpart Institution
      University of Oxford/University of Cambridge/University of Manchester
    • # of Other Institutions
      15
  • [Int'l Joint Research] CIEMAT/IFIC/IFAE(スペイン)

    • Country Name
      SPAIN
    • Counterpart Institution
      CIEMAT/IFIC/IFAE
    • # of Other Institutions
      2
  • [Int'l Joint Research]

    • # of Other Countries
      27
  • [Journal Article] Search for proton decay into three charged leptons in 0.37 megaton-years exposure of the Super-Kamiokande2020

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Physical Review D

      Volume: 101 Pages: 052011

    • DOI

      10.1103/PhysRevD.101.052011

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of the muon neutrino charged-current single π+ production on hydrocarbon using the T2K off-axis near detector ND2802020

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Physical Review D

      Volume: 101 Pages: 012007

    • DOI

      10.1103/PhysRevD.101.012007

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of neutrino and antineutrino neutral-current quasielasticlike interactions on oxygen by detecting nuclear deexcitation γ rays2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Physical Review D

      Volume: 100 Pages: 112009

    • DOI

      10.1103/PhysRevD.100.112009

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for Astronomical Neutrinos from Blazar TXS 0506+056 in Super-Kamiokande2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 887 Pages: L6

    • DOI

      10.3847/2041-8213/ab5863

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sensitivity of Super-Kamiokande with Gadolinium to Low Energy Anti-neutrinos from Pre-supernova Emission2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      The Astrophysical Journal

      Volume: 885 Pages: 133

    • DOI

      10.3847/1538-4357/ab4883

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of the νμ charged-current cross sections on water, hydrocarbon, iron, and their ratios with the T2K on-axis detectors2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Pages: 093C02

    • DOI

      10.1093/ptep/ptz070

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for heavy neutrinos with the T2K near detector ND2802019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Physical Review D

      Volume: 100 Pages: 052006

    • DOI

      10.1103/PhysRevD.100.052006

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295 km2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Physical Review D

      Volume: 99 Pages: 071103

    • DOI

      10.1103/PhysRevD.99.071103

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for neutral-current induced single photon production at the ND280 near detector in T2K2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Journal of Physics G

      Volume: 46 Pages: 08LT01

    • DOI

      10.1088/1361-6471/ab227d

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Atmospheric Neutrino Oscillation Analysis with Improved Event Reconstruction in Super-Kamiokande IV2019

    • Author(s)
      Takuya Hasegawa, et. al.
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2019 Pages: 053F01

    • DOI

      10.1093/ptep/ptz015

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Dual Phase TPC Electronics2020

    • Author(s)
      Takuya Hasegawa
    • Organizer
      DUNE meeting
    • Int'l Joint Research / Invited
  • [Presentation] Dual Phase TPC Electronics2019

    • Author(s)
      Takuya Hasegawa
    • Organizer
      DUNE meeting
    • Int'l Joint Research / Invited

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Published: 2021-01-27  

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