2019 Fiscal Year Annual Research Report
A high-resolution gamma-ray tracking detector for in-beam spectroscopy of unstable nuclei
| Project/Area Number |
19H00679
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ウィマー カスリン 東京大学, 大学院理学系研究科(理学部), 客員共同研究員 (00748478)
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| Co-Investigator(Kenkyū-buntansha) |
DOORNENBAL PIETER 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, 専任研究員 (70574119)
鈴木 大介 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, 研究員 (70769504)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | exotic nuclei / nuclear structure / spectroscopy / gamma-rays |
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| Outline of Annual Research Achievements |
In FY19 the preparatory phase of the HiCARI project "High-resolution Cluster Array at RIBF" has been completed.
Two workshops were organized. In the first one 10-12 April 2019 in Darmstadt, Germany, the project has been presented and the physics case has been established. A call for pre-proposals as well as the formation of a steering committee was established. In the second workshop 26-28 August 2019 in Osaka, Japan, proposals for the NP-PAC were discussed and prepared. They were presented to the NP-PAC committee in December 2019, and 9 experiments with a total number of 43.5 days for experiment were granted. The project was highly evaluated by the committee. The experiments investigate shell structure and collectivity in very exotic nuclei all over the nuclear chart. Using different experimental techniques with high-resolution gamma-ray spectroscopy unprecedented new information will become available.
In the meantime, the on-site preparations took place. Infrastructure support and readout electronics for a digital acquisition system were obtained, installed at the facility, and tested. The high-purity Germanium detectors were delivered from Europe, US, and Japan, and installed at the target location. The whole system was tested and commissioned with test sources.
The development of the simulation software has been finished. The realistic performance of the setup was also presented to the NP-PAC. The event-building and correlation software for the data analysis is also ready. The development of a high-level analysis tool-kit is in progress.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The project status is on schedule. The collaboration was very successful in obtaining beam-time, with 43.5 days for 9 experiments this is much more than anticipated. The program advisory committee of the RIBF as well as the international community highly evaluate the project. The PI has been invited to several conferences to present the project.
The on-site preparations are on schedule and the HiCARI setup is ready to perform experiments.
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| Strategy for Future Research Activity |
In FY2020 we plan to finish the commissioning, and start the experimental campaign. 9 Experiments will investigate the structure of very neutron- and proton-rich nuclei. Highlights are the formation of magic numbers in very exotic nuclei as well as the development of collective phenomena outside of the valley of stability.
It is planned to perform a test and commissioning experiment, which will be the basis of a technical publication to be submitted by the end of FY20. First new results from HiCARI will be presented at conferences, journal publications will follow in the coming years. A workshop to discuss the details of the analysis is planned for the later half of FY20.
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