| Project/Area Number |
21244026
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Tohoku University |
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Principal Investigator |
SAKEMI Yasuhiro 東北大学, サイクロトロン・ラジオアイソトープセンター, 教授 (90251602)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Masatoshi 東北大学, サイクロトロン・ラジオアイソトープセンター, 助教 (30400435)
YOSHIDA Hidetomo 東北大学, サイクロトロン・ラジオアイソトープセンター, 教育研究支援者 (20399744)
MURAKAMI Tetsuya 京都大学, 大学院・理学研究科, 講師 (50219896)
HATANAKA Kichiji 大阪大学, 核物理研究センター, 教授 (50144530)
WAKASA Tomotsugu 九州大学, 大学院・理学研究院, 准教授 (10311771)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥47,840,000 (Direct Cost: ¥36,800,000、Indirect Cost: ¥11,040,000)
Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2009: ¥25,350,000 (Direct Cost: ¥19,500,000、Indirect Cost: ¥5,850,000)
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| Keywords | フランシウム / 冷却不安定原子 / 時間反転対称性 / 表面イオン化器 / 超対称性 / 電気双極子能率 / 表面電離型イオン源 / CP非保存 |
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| Research Abstract |
The search for the permanent electric dipole moment (EDM)of the elementary particle such as the electron is quite important to understand the evolution mechanism of the baryon asymmetry in the universe. In this research program, to study the mechanism of the CP violation with the high accuracy measurement of the electron EDM, we focus on the radioactive element of the francium (Fr), which has the largest enhancement factor of the electron EDM due to the relativistic effect. The new high intensity thermal ionizer with melting target was successfully developed to produce the Fr with the fusion reaction of the <18>^O and <197>^Au. The specifications such as the Fr extraction efficiency of about 35%and production yield with 10^6 Fr+/s well sufficient for the EDM search were achieved. We established the experimental techniques of the Fr production, neutralization, and trapping, which were essential for the EDM search.
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