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Study of atomic coherence for neutrino mass spectroscopy

Research Project

Project/Area Number 17H02896
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionOkayama University

Principal Investigator

Yoshimi Akihiro  岡山大学, 異分野基礎科学研究所, 准教授 (40333314)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Keywordsニュートリノ / コヒーレンス / レーザー / 準安定状態 / 原子コヒーレンス / 高次QED過程 / 素粒子実験 / 原子・分子物理
Outline of Final Research Achievements

This study aims to detect the neutrinos emission associated with the atomic transition, and conducts experiments to control the excitation/coherence formation of atoms into a metastable state and the de-excitation process from them.
Using Xe as the target atom, we conducted a multiphoton excitation experiment with a pulse laser to the first excited state (a metastable state with a lifetime of about 40 seconds). As a result, we succeeded in exciting to the metastable state through E1-M1 and E1-E2 two-photon excitation. In addition, the probe laser beam was introduced and the number of excitations could be calculated to be 1e+6 to 1e+7 per pulse, reaching a stage where it can be compared with the theoretical transition intensity.
The ability to compare the theory and experiment of two-photon transitions involving such forbidden transitions is an important advance for coherence control.

Academic Significance and Societal Importance of the Research Achievements

ニュートリノは現在知られている素粒子の中でも質量・粒子のタイプ等基本的性質が未解明な唯一のものである。日本では巨大加速器・検出器の実験でニュートリノの謎の解明に大きな貢献をしてきた一方、そのような巨大実験では解明が困難と思われる部分もある。そこで本研究課題のような全く異なる実験手法、特に小規模実験を考案し、手法を確立していくことが重要と考えられる。レーザー光で原子分子集団を特殊な状態に遷移させ、量子力学的効果によって弱い過程を能動的に増幅することを目指す本研究課題は価値がある。本研究期間において、光だけが絡む過程ではあるものの、標的原子遷移の弱い過程に関する知見が得られたことは意義がある。

Report

(4 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (15 results)

All 2019 2018 2017 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Geometry-dependent spectra and coherent transient measurement of nearly degenerate four-wave mixing using two-photon resonance2019

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

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 52 Issue: 23 Pages: 235402-235402

    • DOI

      10.1088/1361-6455/ab4a6e

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [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
      2019 Annual Research Report 2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen2017

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

      The Journal of Physical Chemistry A

      Volume: 121 Issue: 20 Pages: 3943-3951

    • DOI

      10.1021/acs.jpca.7b02011

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Frequency dependence of coherently amplified two-photon emission from hydrogen molecules2017

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

      PHYSICAL REVIEW A

      Volume: 96 Issue: 6 Pages: 063827-063827

    • DOI

      10.1103/physreva.96.063827

    • NAID

      120006382538

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Vibrational excitation of hydrogen molecules by two-photon absorption and third-harmonic generation2017

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

      Journal of Physics B: Atomic, Molecular and Optical Physics

      Volume: 51 Issue: 1 Pages: 015401-015401

    • DOI

      10.1088/1361-6455/aa9782

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast x-ray detector system with simultaneous measurement of timing and energy for a single photon2017

    • Author(s)
      Masuda T.、Okubo S.、Hara H.、Hiraki T.、Kitao S.、Miyamoto Y.、Okai K.、Ozaki R.、Sasao N.、Seto M.、Uetake S.、Yamaguchi A.、Yoda Y.、Yoshimi A.、Yoshimura K.
    • Journal Title

      Review of Scientific Instruments

      Volume: 88 Issue: 6 Pages: 063105-063105

    • DOI

      10.1063/1.4989405

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] ニュートリノ質量分光へ向けたXe励起実験の現状2019

    • Author(s)
      今村慧
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Rate amplification of the multi-photon process toward neutrino mass spectroscopy2019

    • Author(s)
      K. Imamura
    • Organizer
      11th International Conference on Fundamental Physics Using Atoms
    • Related Report
      2019 Annual Research Report
  • [Presentation] ニュートリノ質量分光に向けたXe原子の多光子励起2019

    • Author(s)
      佐藤帯子
    • Organizer
      日本物理学会 2019年年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] ニュートリノ質量分光へ向けたXe励起実験の現状2019

    • Author(s)
      今村慧他
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ニュートリノ質量分光に向けたXe原子の多光子励起2019

    • Author(s)
      佐藤帯子他
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ニュートリノ質量分光へ向けたXeガス対向励起実験の開発2018

    • Author(s)
      今村 慧、吉見彰洋 他
    • Organizer
      日本物理学会 第73回年次大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Neutrino spectroscopy with atoms and laser - toward detection of relic neutrino2017

    • Author(s)
      吉見 彰洋
    • Organizer
      International Conference on Light driven Nuclear-Particle physics and Cosmology 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nuclear resonant scattering experiment for observation of 229mTh radiative transition2017

    • Author(s)
      吉見 彰洋
    • Organizer
      International Conference on Laser Spectroscopy (ICOLS 2017)
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 岡山大学 異分野基礎科学研究所 量子宇宙研究コア

    • URL

      http://www.xqw.okayama-u.ac.jp/

    • Related Report
      2017 Annual Research Report

URL: 

Published: 2017-04-28   Modified: 2022-01-27  

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