| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2022: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Outline of Final Research Achievements |
The astrophysical origin of elements such as gold and platinum formed through rapid neutron-capture process, the so-called r-process, has been identified to be binary neutron star mergers through the detection of gravitational wave from the corresponding object in 2017 summer. Since this discovery, we have entered the era when the verification of neutron star mergers as the site of r-process is strongly desired. In this study, we have assessed this issue from the unique approaches using stellar abundances, the models for Galactic chemical evolution, and meteorite analysis. We eventually got to the conclusion that stellar abundances in the Galaxy are compatible with the hypothesis that rare core-collapse supernovae together with neutron star mergers are the origin of r-process elements. In addition, we find that the ejection of r-process elements from neutron star-black hole binaries is the another key factor for understanding the r-process evolution in the early Galaxy.
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