| Project/Area Number |
23KF0125
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 外国 |
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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 |
大津 秀暁 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, チームリーダー (90302075)
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| Co-Investigator(Kenkyū-buntansha) |
LEMARIE JULIEN 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 外国人特別研究員
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| Project Period (FY) |
2023-07-26 – 2026-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2025: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 2024: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2023: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Unstable nuclei / Gamma ray spectroscopy / Dipole response |
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| Outline of Research at the Start |
原子核は陽子と中性子が強い相互作用で結合したもので、密度は飽和しておりほぼ一定の値を持つと知られていた。一方で、陽子/中性子比が異なる原子核では、飽和密度がどう変容するか、十分に理解されているとはいえない。
カルシウム同位体は、陽子数Z=20 の魔法数をとり、陽子側は比較的不活性であると考えられる。原子核の性質は主に中性子数Nに依存して変化していると考えられている。中性子過剰カルシウム同位体の核分光実験を行い、広い励起エネルギー領域に対して、電磁応答および核反応による応答を系統的に調べている。本研究ではこれらの実験データ解析を継続的に進め、複数のカルシウム同位体の核/電磁応答測定結果を得る。
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| Outline of Annual Research Achievements |
The data analysis of the experiment 50Ca+Pb done at RIKEN -RIBF in 2017 is undergoing. The reaction cross-section for the production of 48Ca has been determined. The detectors are fully calibrated, the calibration has been verified, and the data is ready for the physics analysis.
The gamma-ray array CATANA has been prepared and used during the April 2024 experiments. CATANA has been operated with two different gain: the normal output of photomultiplier for gamma-ray measurement, and the first dynode output for proton energy measurement; data from each output has been recorded with independent acquisition electronics. For the first time, CATANA was running with 2 gain for all of its detectors. We have successfully verified correlation of both electronics with the rest of the detectors, and observed proton-proton correlation emitted in opposite direction.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The data analysis has been a bit delayed due to verification for the neutron detection, but overall progress has been smooth.
Malfunctioning detectors of CATANA has been repaired before the experiments in April 2024, and it thus have been running with 140 x2 working channels. Analysis programs have been prepared before hand, and has been improved during the experiments and correlation between every detectors of the experiments and CATANA could be seen while the experiment was running.
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| Strategy for Future Research Activity |
Using a simulation, the efficiencies of every detectors of the 2017 experiment will be determined, and will be used to determine the cross-section spectra.
An other simulation will be made with the 50Ca fully simulated with theoretical model. This simulation and the experimental data will be compared in order to probe the dipole resonance of the 50Ca.
New detectors will be mounted on CATANA in the coming year to improve its angle coverage.
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