| Project/Area Number |
18540249
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Yamagata University |
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Principal Investigator |
KATO Seigo Yamagata University, Faculty of Science, Professor (70013422)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Hiroshi Yamagata University, Networking and Computing Service Center, Associate Professor (80241727)
TAJIMA Yasuhisa Yamagata University, Networking and Computing Service Center, Associate Professor (50311577)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,070,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥570,000)
Fiscal Year 2007: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | GDH sum rule / gamma-ray detector / SPring-8 / ヘリシティ依存断面積 / 光電子増倍管 |
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| Research Abstract |
Measurements of the helicity dependent photo-absorption cross-section for the nucleon allow us to verify the GDH sum rule by accumulating the energy dependent data. The experiment to perform them is planned at Spring-8. The purpose of the current research is construction of the gamma-ray detector which is necessary in the experiment by performing Research and Development. The gamma-ray detector should have high efficiency even for the low energy gamma-rays (less than 100 MeV), small insensitive area and be capable of being operated under high magnetic field condition. In 2006, a series of basic test with cosmic rays has been carried out. In 2007, In 2007, construction of the prototype had been planned based on the results of the basic tests performed in the previous year. It turned out that it is necessary to have more ideas on the mechanical structure for achieving a small insensitive area. Basically, the large weight of the gamma-ray detector made of heavy metal such as lead, 1 ton for the current detector, gives problems. We corrected the design many times and evaluated the strength of the structure. And finally we successfully overcome the problems and determined the final design
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