Activity of the proto-Sun revealed by multi-isotope analyses

• Project/Area Number: 15K17791
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Hokkaido University
• Principal Investigator: Bajo Ken-ichi 北海道大学, 理学研究院, 助教 (70624758)
• Research Collaborator: OKAZAKI Ryuji ; KAWASAKI Noriyuki
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 希ガス同位体 / 二次イオン質量分析 / 消滅核種 / 原始太陽 / 太陽宇宙線 / 希ガス同位体分析 / Al-Mg年代 / Be-B同位体分析 / 局所同位体分析 / CAI / メリライト / 銀河宇宙線 / Ca-Al rich inclusion / Solar cosmic ray / Spallogenic nuclides / Noble gas

Outline of Final Research Achievements

Ca-Al-rich inclusions (CAIs) in primitive chondrite meteorites contain detectable amounts of extinct nuclides such as 26Al (half life of 0.705 Myr) and 10Be (half life of 1.36 Myr). Especially, excess 10Be in CAIs, which would have been produced by solar cosmic ray (SCR) spallation, suggests that the proto-sun was more radiative than the present sun [1]. The intense SCRs could also produce 22Na, which decays to 22Ne (half life of 2.61 yr), from Mg, Al, and Si via spallation reaction. As sodium is a minor element composing melilite crystals of igneous CAIs [2, 3], excess 22Na could be found in CAIs formed at the early stage of the solar system evolution. However, such CAIs with excess 22Ne derived from 22Na have not been observed . Here, we report the excess in 22Ne in an igneous CAI from Allende CVox.

Research Products

• [Int'l Joint Research] Korean Polar Research Institute (KOPRI)(韓国)
• [Journal Article] High spatial resolution imaging of helium isotope by TOF-SNMS. (2016)
  • Author(s): Bajo, K.-i., Itose, S., Matsuya, M., Ishihara, M., Uchino, K., Kudo, M., Sakaguchi, I. and Yurimoto, H.
  • Journal Title: Surf. Interface Anal. Volume: 48 Issue: 11 Pages: 1190-1193
  • DOI: 10.1002/sia.6085
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evaluation of multi-turn time-of-flight mass spectrum of laser ionization mass nanoscope. (2016)
  • Author(s): Tonotani, A., Bajo, K.-i., Itose, S., Ishihara, M., Uchino, K. and Yurimoto, H.
  • Journal Title: Surf. Interface Anal. Volume: 48 Issue: 11 Pages: 1122-1126
  • DOI: 10.1002/sia.6112
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Quantitative analysis of helium by post-ionization method using femtosecond laser technique (2016)
  • Author(s): H. Yurimoto, K. Bajo, I. Sakaguchi, T. Suzuki, J.G. A.J.G. Jurewicz, S. Itose, K. Uchinof, M. Ishihara
  • Journal Title: Surface and Interface Analysis Volume: 48 Issue: 11 Pages: 1181-1184
  • DOI: 10.1002/sia.6119
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High spatial resolution imaging of helium isotope by TOF-SNMS (2016)
  • Author(s): K. Bajo, S. Itose, M. Matsuya, M. Ishihara, K. Uchino, M. Kudo, I. Sakaguchi, and H. Yurimoto
  • Journal Title: Surface and Interface Analysis Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Depth profiling analysis of solar wind helium collected in diamond-like carbon film from <i>Genesis</i> (2015)
  • Author(s): Bajo, K., Olinger, C. T., Jurewicz, A. J. G., Burnett, D. S., Sakaguchi, I., Suzuki, T., Itose, S., Ishihara, M., Uchino, K., Wieler, R. and Yurimoto, H.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 49 Issue: 5 Pages: 559-566
  • DOI: 10.2343/geochemj.2.0385
  • NAID: 130005101418
  • ISSN: 0016-7002, 1880-5973
  • Year and Date: 2015-09-30
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Spallogenic 22Na in an Allende Ca-Al-rich inclusion (2018)
  • Author(s): Ken-ichi BAJO
  • Organizer: Solar System Symposium in Sapporo 2018
  • Int'l Joint Research
• [Presentation] Genesis DOS試料のヘリウム・ネオン深さ方向分析 (2016)
  • Author(s): 馬上謙一，殿谷梓，C. T. Olinger, A. J. G. Jurewicz, D. S. Burnett，坂口勲，鈴木拓，糸瀬悟，石原盛男， 内野喜一郎，R. Wieler，圦本尚義
  • Organizer: 日本質量分析学会同位体比部会
  • Place of Presentation: 秋田温泉さとみ(秋田県・秋田市)
  • Year and Date: 2016-11-16
• [Presentation] Micro distribution of solar wind helium on Itokawa particles (2016)
  • Author(s): K. Bajo, I. Sakaguchi, T. T. Suzuki, S. Itose, M. Matsuya, M. Ishihara,K. Uchino and H. Yurimoto
  • Organizer: International Workshop: Planetary Science and Space Exploration
  • Place of Presentation: 東北大学（宮城県・仙台市）
  • Year and Date: 2016-07-04
  • Int'l Joint Research / Invited
• [Presentation] Micro distribution of solar wind helium on Itokawa particles (2016)
  • Author(s): K. Bajo, I. Sakaguchi, T. T. Suzuki, S. Itose, M. Matsuya, M. Ishihara,K. Uchino and H. Yurimoto
  • Organizer: Goldschmidt 2016
  • Place of Presentation: パシフィコ横浜（神奈川県・横浜市）
  • Year and Date: 2016-06-26
  • Int'l Joint Research
• [Presentation] 太陽風を捕集したGenesis DOS試料のヘリウム深さ方向分析 (2016)
  • Author(s): 馬上謙一，C. T. Olinger, A. J. G. Jurewicz, D. S. Burnett，坂口勲，鈴木拓，糸瀬悟，石原盛男， 内野喜一郎，R. Wieler，圦本尚義
  • Organizer: 第64回質量分析総合討論会
  • Place of Presentation: ホテル阪急エキスポパーク（大阪府・吹田市）
  • Year and Date: 2016-05-18
• [Presentation] High spatial resolution imaging of helium isotope by TOF-SNMS (2016)
  • Author(s): Depth profiling analysis of solar wind helium collected in diamond-like carbon film from Genesis
  • Organizer: Solar-System symposium in Sapporo 3S
  • Place of Presentation: ルスツリゾート（北海道・虻田郡留寿都村）
  • Year and Date: 2016-02-17
  • Int'l Joint Research
• [Presentation] Micro distribution of solar wind helium on Itokawa particles (2015)
  • Author(s): K. Bajo, I. Sakaguchi, T. T. Suzuki, S. Itose, M. Matsuya, M. Ishihara,K. Uchino and H. Yurimoto
  • Organizer: HAYABUSA2015: 3rd Symposium of Solar System Materials
  • Place of Presentation: JAXA 相模原キャンパス（神奈川県・相模原市）
  • Year and Date: 2015-11-18
  • Int'l Joint Research
• [Presentation] Data Acquisition Electronic System for Time-of-Flight Sputtered Neutral Mass Spectrometer (2015)
  • Author(s): K. Bajo, O. Fujioka, S. Itose, M. Ishihara, K. Uchino and H. Yurimoto
  • Organizer: 10th International Symposium on Atomic Level Characterizations for New Materials and Devices '15 (ALC'15)
  • Place of Presentation: くにびきメッセ（島根県・松江市）
  • Year and Date: 2015-10-25
  • Int'l Joint Research
• [Presentation] High Spatial Resolution Helium Isotope Imaging with LIMAS (2015)
  • Author(s): K. Bajo, S. Itose, M. Matsuya, M. Ishihara, K. Uchino, I. Sakaguchi and H. Yurimoto
  • Organizer: 10th International Symposium on Atomic Level Characterizations for New Materials and Devices '15 (ALC'15)
  • Place of Presentation: くにびきメッセ（島根県・松江市）
  • Year and Date: 2015-10-25
  • Int'l Joint Research
• [Presentation] トンネルイオン化スパッタ粒子質量分析による局所希ガス同位体分析の現状 (2015)
  • Author(s): 馬上謙一
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 幕張メッセ（千葉県・千葉市美浜区）
  • Year and Date: 2015-05-24
  • Invited