| Project/Area Number |
15360506
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
IKEDA Nobuo Kyushu University, Faculty of Engineering, Professor, 大学院・工学研究院, 教授 (70193208)
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| Co-Investigator(Kenkyū-buntansha) |
UOZUMI Yusuke Kyushu University, Faculty of Engineering, Associate Professor, 大学院・工学研究院, 助教授 (00232801)
WAKABAYASHI Genichiro Kyushu University, Faculty of Engineering, Research Associate, 大学院・工学研究院, 助手 (90311852)
WATANABE Yukinobu Kyushu University, Faculty of Engineering, Associate Professor, 大学院・総合理工学研究院, 助教授 (30210959)
SAGARA Kenshi Kyushu University, Faculty of Sciences, Professor, 大学院・理学研究院, 教授 (00128026)
TERANISHI Takashi Kyushu University, Faculty of Sciences, Associate Professor, 大学院・理学研究院, 助教授 (10323495)
的場 優 九州大学, 大学院・工学研究院, 教授 (60037827)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2004: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 2003: ¥8,100,000 (Direct Cost: ¥8,100,000)
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| Keywords | nuclear data / astrophysical nuclear reactions / mass separator / microchannel plate / heavy-ion / solid state detector / particle identification / 原子番号 / ストラグリング / 厚さ一様性 / 飛跡追跡 / 低エネルギー |
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| Research Abstract |
A new focal plane detector system for a recoil mass separator at Kyushu University tandem accelerator laboratory, designed to be capable of obtaining information of light heavy-ions with energies of less than 1 MeV/u on two-dimensional inclined angles and positions on the focal plane, energy, mass number and atomic number simultaneously, has been developed. The system consists of a solid state detector (SSD) and two two-dimensional position sensitive microchannel plates (MCPs) to detect ion-induced electrons from thin foils located in front of the SSD.
The SSD with large active area was in beginning planned to be adopted to realize long flight pass for the measurement of time-of-flight. However, the performance test of the SSD with large active area using beams from the tandem accelerator has revealed significant dependence of pulse height deficit on the atomic number of the measured particles even in the range of atomic numbers less than 10, which has not been observed for the SSDs with relatively small active area. These findings imposed change of the design of the detection system to place the SSD with small active area at focal plane.
We adopted a particle identification method using the emission yield of electrons from the downstream foil. Homogeneity of commercial foils was tested using a ^<12>C beam from the tandem accelerator and found that the Mylar foil has inhomogeneity of less than 3%. With this foil, the atomic number resolution has been estimated for 0.2 and 0.5 MeV/u ^<16>O to be 0.2 and 0.1, respectively, taking the energy straggling into account.
The performance test of the whole system is now in progress and a trial to determine the ^4He(^<12>C,^<16>O)γ reaction rate at stellar energies using the separator and the detector system is about to start.
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