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Amplification of the counter propagating two-photon emission toward the neutrino mass spectroscopy

Research Project

Project/Area Number 17K14292
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOkayama University

Principal Investigator

Masuda Takahiko  岡山大学, 異分野基礎科学研究所, 特任講師 (90733543)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywordsニュートリノ / パラ水素 / コヒーレント増幅 / コヒーレンス / 二光子放出 / 素粒子実験 / 原子・分子物理
Outline of Final Research Achievements

We observed two-photon emission signal from the first vibrationally excited state of parahydrogen gas coherently excited by counter-propagating laser pulses. A single narrow-linewidth laser source has roles in the excitation of the parahydrogen molecules and the induction of the TPE process. We measured dependences of the signal energy on the detuning, target gas pressure, and input pulse energies. These results are qualitatively consistent with those obtained by numerical simulations based on Maxwell-Bloch equations with one spatial dimension and one temporal dimension. This study of the TPE process in the counter-propagating injection scheme is an important step toward neutrino mass spectroscopy.

Academic Significance and Societal Importance of the Research Achievements

素粒子物理学の中でもニュートリノは未知の性質が多く残されている。特にその基本的性質である質量が未確定なのは特筆に値する。本研究は、従来の原子核崩壊を使った手法ではなく、原子を用いた高分解能測定によってニュートリノの質量を確認するという「ニュートリノ質量分光」実験のための基礎研究である。理論と矛盾しない実験結果が示され、数値計算による定量的定性的な理解も進めることができた。これにより将来のニュートリノ質量分光実験に近づいたと言える成果である。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (7 results)

All 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Coherent two-photon emission from hydrogen molecules excited by counter-propagating laser pulses2019

    • Author(s)
      Hiraki Takahiro、Hara Hideaki、Miyamoto Yuki、Imamura Kei、Masuda Takahiko、Sasao Noboru、Uetake Satoshi、Yoshimi Akihiro、Yoshimura Koji、Yoshimura Motohiko
    • Journal Title

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 52 Issue: 4 Pages: 045401-045401

    • DOI

      10.1088/1361-6455/aafbd0

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Rate amplification of the multi-photon process toward neutrino mass spectroscopy2019

    • Author(s)
      Kei Imamura
    • Organizer
      Fundamental Physics Using Atoms 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coherent two-photon emission from hydrogen molecules towards neutrino mass spectroscopy2018

    • Author(s)
      Hideaki Hara for the SPAN collaboration
    • Organizer
      International Conference on Atomic Physics 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ニュートリノ質量分光を目指した気体および固体水素振動準位間の位相共役二光子放出実験2018

    • Author(s)
      宮本祐樹、原秀明, 平木貴宏, 今村慧, 増田孝彦, 笹尾登, 植竹智, 吉見彰洋, 吉村浩司, 吉村太彦
    • Organizer
      日本物理学会2018秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ニュートリノ質量分光のための対向レーザー励起による コヒーレント二光子放出実験2018

    • Author(s)
      平木貴宏、原秀明、今村慧、増田孝彦、宮本祐樹、 笹尾登、植竹智、吉見彰洋、吉村浩司、吉村太彦
    • Organizer
      日本物理学会2018秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Coherently amplified multi-photon emission toward neutrino mass spectroscopy2018

    • Author(s)
      Takahiko Hiraki for the SPAN collaboration
    • Organizer
      10th International workshop on Fundamental Physics Using Atoms
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ニュートリノ質量分光のためのパラ水素ガスを用いた対向レーザー励起実験2018

    • Author(s)
      平木貴宏、原秀明、今村慧、増田孝彦、宮本祐樹、笹尾登、 高江洲義太郎、植竹智、吉見彰洋、吉村浩司、吉村太彦
    • Organizer
      日本物理学会第73回年次大会 東京理科大学
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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