| Budget Amount *help |
¥42,510,000 (Direct Cost: ¥32,700,000、Indirect Cost: ¥9,810,000)
Fiscal Year 2016: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2015: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2014: ¥26,130,000 (Direct Cost: ¥20,100,000、Indirect Cost: ¥6,030,000)
|
|---|
| Outline of Final Research Achievements |
The chemical technique for mutual separation of rare earth elements (REEs) was developed, and was applied for isotopic studies of cosmocheimcal materials. Among a series of eucrites that are considered to have been differentiated in the early solar system, dessert eucrites showed significant effect of terrestrial contamination, and their Rb-Sr system were largely disturbed. On the other hand, the Sm-Nd system of a series of eucrites showed less effect of the terrestrial contamination, and provided chronological information on the early differentiation in the solar system. All five kinds of luna surficial materials collected by the Apollo mission showed isotopic excesses of lighter isotopes having proton-rich nuclides and heavier isotopes having neutron-rich nuclides of some REE caused by neutron capture and spallation reactions due to long-term exposure by cosmic rays.
|
