Elucidation of the r-process second peak from key nuclear mass measurements at N=82 with the Rare-RI Ring at RIKEN/RIBF
| 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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Report
(4 results)
Research Products
(16 results)
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[Journal Article] Efficiency and timing performance of time-of-flight detector utilizing thin foils and crossed static electric and magnetic fields for mass measurements with Rare-RI Ring facility2020
Author(s)
S. Suzuki, A. Ozawa, D. Kamioka, Y. Abe, M. Amano, H. Arakawa, Z. Ge, K. Hiraishi, Y. Ichikawa, K. Inomata, A. Kitagawa, T. Kobayashi, Hg. Li, T. Matsumoto, T. Moriguchi, M. Mukai, D. Nagae, S. Naimi, S. Omika, S. Sato, Y. Tajiri, K. Wakayama, T. Yamaguchi
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Journal Title
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume: 965
Pages: 163807-163807
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Development of a new in-ring beam monitor in the Rare-RI Ring2019
Author(s)
S. Omika, T. Yamaguchi, N. Tadano, Y. Abe, M. Amano, Z. Ge, D. Kamioka, T. Moriguchi, D. Nagae, S. Naimi, A. Ozawa, F. Suzaki, S. Suzuki, T. Suzuki, T. Uesaka, M. Wakasugi, K. Wakayama, Y. Yamaguchi
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Journal Title
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 463
Pages: 241-243
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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