| Project/Area Number |
19K03901
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
NAIMI SARAH 国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (40747135)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2020: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | nuclear mass / storage ring / r-process / position detector / Mass Measurement / mass measurement / Storage Ring / Position detecto / Nuclear masses / Position detector / Rare-RI Ring |
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| Outline of Research at the Start |
Reach the r-process bottleneck by measuring nuclear masses of the most neutron-rich nuclei
Measure 11 new nuclear masses for the first time
Increase Rare-RI Ring efficiency to 10%, making it the most efficient online mass spectrometer for Rare Isotopes in the world
Build the first position-sensitive detector to be used in the Rare-RI Ring
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| Outline of Final Research Achievements |
Mass measurement of rare isotope 123Pd produced at RIBF/ RIKEN was performed with the Rare-RI Ring. The mass of this isotope was used to perform astrophysical calculation to estimate the r-process abundances of mass A=122 and A=123. We find that the abundance ratio of these two masses can be reproduced when using the new mass of 123Pd in the calculation.
We have also finalized the development of a new position-sensitive detector for the Rare-RI Ring. The detector position resolution is similar to that of the RIBF standard detector, with the advantage of being operable under the high-vacuum condition in the Rare-RI Ring.
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| Academic Significance and Societal Importance of the Research Achievements |
Mass measurements of 123Pd was performed to investigate its influence in the r-process synthesis of chemical elements tin and antimony. Such measurement is only possible only at RIBF/RIKEN.
The results of this experiment was published in international journal and a press release was prepared.
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