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Study of Thorium-229 isomeric state: towards new science with nuclear clock

Research Project

Project/Area Number 18H03713
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Isobe Tadaaki  国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 専任研究員 (40463880)

Co-Investigator(Kenkyū-buntansha) 服部 香里  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (10624843)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥46,930,000 (Direct Cost: ¥36,100,000、Indirect Cost: ¥10,830,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥42,770,000 (Direct Cost: ¥32,900,000、Indirect Cost: ¥9,870,000)
Keywords原子核時計 / 不安定核 / RIBF / TES / トリウム / トリウム-229
Outline of Final Research Achievements

The dynamic energy range of conventional TES is up to about 10 keV. For our research project, we need novel TES which has wider energy dynamic range for 30 keV X-ray measurement. Then, we started the collaboration with NIST to invent the novel TES which has the dynamic energy range of up to 40 keV. In order to realize such kind of TES, we made a prototype TES which employs Au as absorber of X-ray.
In addition, we proceed the designing of time-of-flight mass separator system. A silicon detector is under preparation to detect the electron coming from Th-229 decay.

Academic Significance and Societal Importance of the Research Achievements

TESはゲルマニウムをはじめとする半導体検出器よりさらに分解能の良い次世代検出器として注目を浴びている。これまでTESは10keV以下のX線領域をターゲットとした研究開発が行われてきたが、本研究における極低励起準位を探索する為、より高エネルギー領域のX線をターゲットとした検出器が開発されつつある。これは本研究にとどまらず、ミューオン原子といった他のX線高精度測定への応用が期待できる。

Report

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

    (9 results)

All 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (7 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] NIST(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Transition-Edge Sensor Optimization for Hard X-ray Applications2021

    • Author(s)
      Yan Daikang、Yamada Shinya、et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Issue: 5 Pages: 1-5

    • DOI

      10.1109/tasc.2021.3059972

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dynamical Response of Transition-Edge Sensor Microcalorimeters to a Pulsed Charged-Particle Beam2021

    • Author(s)
      Okumura Takuma、Azuma Toshiyuki、Bennett Douglas A.、Caradonna Pietro、Chiu I-Huan、Doriese W. Bertrand、Durkin Malcolm S.、Fowler Joseph W.、Gard Johnathon D.、Hashimoto Tadashi、Hayakawa Ryota、Hilton Gene C.、Ichinohe Yuto、Indelicato Paul et al.
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 31 Issue: 5 Pages: 1-4

    • DOI

      10.1109/tasc.2021.3067793

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Broadband high-energy resolution hard x-ray spectroscopy using transition edge sensors at SPring-82021

    • Author(s)
      Yamada Shinya、Ichinohe Yuto、et al.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 1 Pages: 013103-013103

    • DOI

      10.1063/5.0020642

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Shell structure of the neutron-rich isotopes Co69,71,732020

    • Author(s)
      Lokotko T. et al.
    • Journal Title

      Physical Review C

      Volume: 101 Issue: 3 Pages: 034314-034314

    • DOI

      10.1103/physrevc.101.034314

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Microwave SQUID Multiplexer for Readout of Optical Transition Edge Sensor Array2020

    • Author(s)
      Nakada N. et al.
    • Journal Title

      Journal of Low Temperature Physics

      Volume: 199 Issue: 1-2 Pages: 206-211

    • DOI

      10.1007/s10909-019-02298-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of an Optical Transition-Edge Sensor Array2020

    • Author(s)
      Toshio K. et al.
    • Journal Title

      Journal of Low Temperature Physics

      Volume: 199 Issue: 1-2 Pages: 27-33

    • DOI

      10.1007/s10909-020-02367-9

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Half-lives of Sr73 and Y76 and the consequences for the proton dripline2019

    • Author(s)
      Sinclair L. et al.
    • Journal Title

      Physical Review C

      Volume: 100 Issue: 4 Pages: 044311-044311

    • DOI

      10.1103/physrevc.100.044311

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Measurement of Th-229 low lying isomeric state with MRTOF+TES system at RIKEN-RIBF2019

    • Author(s)
      Tadaaki Isobe
    • Organizer
      18th International Workshop on Low Temperature Detectors (LTD-18)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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