| Project/Area Number |
15360504
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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 | Nagoya University |
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Principal Investigator |
KAWADE Kiyoshi Nagoya University, Graduate School of Engineering, Department of Material Science and engineering, Professor, 大学院・工学研究科, 教授 (70023215)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBATA Michihiro Nagoya University, Radioisotope Research Center, Associate Professor, アイソトープ総合センター, 助教授 (30262885)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥7,200,000 (Direct Cost: ¥7,200,000)
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| Keywords | Atomic Mass / β-decay / β-decay energy / Unstable nuclei / Total absorption detector / Monte Carlo simulation / EGS4 / Differential pumping |
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| Research Abstract |
Beta-decay energy(Q_β) has been measured with a total absorption type detector which consists of a large volume HPGe detector and an annular BGO scintillation detector for the anti-coincidence detector.
The HPGe detector, which has a center hole in which are introduced the radioactive sources, can be measured with large solid angle, and the BGO scintillation detector can measure the scattering and/or transmitting photons from the HPGe detector. Finally, the highest energy point of the measured spectra, namely end-point, corresponds to the Q_β.
This detector was set at the on-line mass separator installed at the Kyoto University Reactor (KUR-ISOL) and tested its performance as a Q_β detector. The nuclei of neutron-rich Rb and Cs isotopes that have well-determined Q_β values (3〜8 MeV) were measured. By using the response functions for mono-energetic electrons and photons simulated by the Monte Carlo Code of EGS4, the end-point of the obtained total absorption spectra were determined. Compared with the end-points to the evaluated values, the systematic uncertainty for the detector was evaluated to be 20 keV. On the basis of the above analysis, the nucleus of ^<153>Pr was measured. The Q_β of this nucleus had been measured with another type total absorption detector which consists in two large-volume BGO scintillators. The present value is in agreement with the previous value with in the uncertainty.
We are scheduled to measure the nuclei around A=150 with KUR-ISOL and to compare the results with systematics or theoretically predicted values.
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