| Project/Area Number |
06640370
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
TERASAWA Tatsuo Tohoku University, Faculty of Science, Associate Professor, 理学部, 助教授 (40004436)
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| Co-Investigator(Kenkyū-buntansha) |
MARUYAMA Koichi Tokyo University, Institute for Nuclear Study, Research Associate, 原子核研究所, 助手 (50114658)
YAMAZAKI Hirohito Tohoku University, Faculty of Science, Research associate, 理学部, 助手 (90260413)
TAMAE Tadaaki Tohoku University, Faculty of Science, Associate Professor, 理学部, 助教授 (10124174)
MAEDA Kazushige Tohoku University, School of Science, Associate Professor, 理学研究科, 助教授 (20125652)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | polarized ^3He target / polarized rubidium / optical pumping / Farady rotation / DELTA-resonance / photonuclear reaction |
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| Research Abstract |
This research project aims to investigate nucleon-nucleon correlations in ^3He by means of photonuclear reactions using a polarized ^3He target. The polarized target is obtained by a spin exchange reaction between a polarized alkaline atom and a target atom.
As a first step to make the polarized ^3He target, we tried to produce polarized rubidium atoms using an optical pumping method with a circularly polarized laser light. We have used a 0.5W titanium-sapphire laser as the source, and, in order to prevent the depolarization due to the collision between produced polarized atoms and the pumping cell wall, we have coated the wall with dimethyldichlorosilane.
A search for the most optimum condition for the production needs a quick and precise measurement of the polarization and the tthickness of the products. We have developed a high speed measuring system, which enable to measure the Faraday rotation abgle with the precision less than 0.01 deg.
Finally we have succeeded to produce a polarized rubidium atoms having the polarization of 0.4 with the thickness of 10^<14> atoms/cm^2.
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