High precision isotope analyses of presolar grains for the study of stellar nucleosynthesis

用于研究恒星核合成的前太阳颗粒高精度同位素分析

• 批准号: 21740388
• 负责人: YOKOYAMA Tetsuya
• 金额: $ 2.83万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740388/
• 关键词: 地球外物質化学; 高精度同位体分析; 始原的隕石; プレソーラー粒子; 元素合成; 重元素; 同位体; TIMS; 母天体プロセス; ICPMS

We have investigated Os isotope compositions in chondritic acid residues enriched in presolar grains. We found that bulk chondrites contain various types of presolar phases that are rich in either s-process-Os or r-process-Os. The r-process-enriched phases could be extracted from chondrites by a relatively mild acid condition, while s-process-enriched phases appeared to be highly acid resistant. We also found that some r-process-enriched phases were selectively destroyed via parent body aqueous alteration.

我们研究了太阳前颗粒中富集的球粒酸残基的Os同位素组成。我们发现块状球粒陨石含有各种类型的前太阳相，富含s-过程o或r-过程o。富r工艺相可以在相对温和的酸性条件下从球粒陨石中提取，而富s工艺相则表现出很强的耐酸性。我们还发现一些富r过程相通过母体的水蚀作用被选择性地破坏。

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