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Dating of presolar grains by nuclear cosmochronology

Research Project

Project/Area Number 15K13602
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Geochemistry/Cosmochemistry
Research InstitutionTokyo Institute of Technology

Principal Investigator

Yokoyama Tetsuya  東京工業大学, 理学院, 准教授 (00467028)

Co-Investigator(Kenkyū-buntansha) 辻本 拓司  国立天文台, 光赤外研究部, 助教 (10270456)
Project Period (FY) 2015-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
KeywordsU-Th核年代法 / プレソーラー粒子 / TIMS / r-process / U-Th核年代学 / 銀河化学進化
Outline of Final Research Achievements

High precision analysis of U and Th abundances is key for dating presolar grains by U-Th nuclear cosmochronology. In this study, we have developed an isotope dilution TIMS method that enables the determination of 1 pg U and Th with analytical reproducibilities of 0.45% and 1.3%, respectively. The U-Th cosmochronology with this method would provide a 0.7 Gyr of uncertainty for the age of presolar grains determined.
On the other hand, we constrained the origin and evolution of r-process nuclides in the solar vicinity by a new theoretical study that combined the chemical composition of meteorites with galactic chemical evolution models and astronomical observations. Consequently, the timing of last r-process nucleosynthesis that contributed the solar system was determined to be 0.13-0.14 Gyr before the onset of solar system formation.

Report

(3 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • Research Products

    (12 results)

All 2017 2016 2015

All Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 5 results,  Acknowledgement Compliant: 2 results) Presentation (6 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Chemical evolution of 244Pu in the solar vicinity and its implication for the properties of r-process production.2017

    • Author(s)
      Tsujimoto, T., Yokoyama, T. and Bekki, K.
    • Journal Title

      Astrophys. J. Lett.

      Volume: 835 Issue: 1 Pages: L3-L3

    • DOI

      10.3847/2041-8213/835/1/l3

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Precise isotope analysis for sub-nanogram lead by total evaporation thermal ionization mass spectrometry (TE-TIMS) coupled with 204Pb-207Pb double spike method.2017

    • Author(s)
      Fukami, Y., Tobita, M., Yokoyama, T., Moriwaki, R., Usui, T.
    • Journal Title

      Journal of Analytical Atomic Spectrometry

      Volume: 32 Issue: 4 Pages: 848-857

    • DOI

      10.1039/c6ja00455e

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Nucleosynthetic isotope variation of siderophile and chalcophile elements in the Solar System2016

    • Author(s)
      Yokoyama, T., Walker, R.J.
    • Journal Title

      Reviews in Mineralogy and Geochemistry

      Volume: 81 Issue: 1 Pages: 107-160

    • DOI

      10.2138/rmg.2016.81.03

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Molybdenum isotope analysis by negative thermal ionization mass spectrometry (N-TIMS): Effects of oxygen isotopic compositions2016

    • Author(s)
      Nagai, Y., Yokoyama, T.
    • Journal Title

      Journal of Analytical Atomic Spectrometry

      Volume: 31 Issue: 4 Pages: 948-960

    • DOI

      10.1039/c5ja00381d

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] The r-process in Magnetorotational Supernovae2015

    • Author(s)
      Tsujimoto, Takuji; Nishimura, Nobuya
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 811 Issue: 1 Pages: L10-L10

    • DOI

      10.1088/2041-8205/811/1/l10

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Chemical feature of Eu abundance in the Draco dwarf spheroidal galaxy2015

    • Author(s)
      Tsujimoto, Takuji; Ishigaki, Miho N.; Shigeyama, Toshikazu; Aoki, Wako
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 67 Issue: 3

    • DOI

      10.1093/pasj/psv035

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] Lead isotopic systematics of Martian meteorite Zagami.2016

    • Author(s)
      Tobita M, Usui T, Niihara T, Misawa K, Yokoyama T.
    • Organizer
      The Seventh Symposium on Polar Science
    • Place of Presentation
      Tachikawa, Tokyo
    • Year and Date
      2016-12-02
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis of highly siderophile elements in metal phases from CR chondrite, NWA 801.2016

    • Author(s)
      Nakanishi N, Yokoyama T, Okabayashi S, Shimazaki K, Usui T, Iwamori H.
    • Organizer
      The Seventh Symposium on Polar Science
    • Place of Presentation
      Tachikawa, Tokyo
    • Year and Date
      2016-12-01
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 寿命放射性核種244Puの太陽系における化学進化2016

    • Author(s)
      辻本拓司
    • Organizer
      同位体比部会
    • Place of Presentation
      秋田市、秋田温泉さとみ
    • Year and Date
      2016-11-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] Origin and evolution of r-nuclides in Local Universe2016

    • Author(s)
      Tsujimoto, T., Yokoyama, T.
    • Organizer
      Goldschmidt Conference
    • Place of Presentation
      Yokohama, Kanagawa
    • Year and Date
      2016-06-29
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nucleosynthetic isotope variation of siderophile and chalcophile elements in the Solar System2015

    • Author(s)
      Yokoyama, T, Walker, R.J.
    • Organizer
      Mineralogical Society of America & Geochemistry Short Course
    • Place of Presentation
      La Jolla, USA
    • Year and Date
      2015-12-11
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Chemical footsteps of r-nuclides in satellite galaxies of Local Group2015

    • Author(s)
      Tsujimoto, T.
    • Organizer
      In the Footsteps of galaxies: tracing the evolution of environmental effects
    • Place of Presentation
      Soverato, Italy
    • Year and Date
      2015-09-07
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research

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Published: 2015-04-16   Modified: 2018-03-22  

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