| Project/Area Number |
24360037
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
KURAMOTO NAOKI 独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (60356938)
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| Co-Investigator(Kenkyū-buntansha) |
WASEDA Atsushi 産業技術総合研究所, 計測標準研究部門, 主任研究員 (20272172)
AZUMA Yasushi 産業技術総合研究所, 計測標準研究部門, 主任研究員 (30356365)
FUJIMOTO Hiroyuki 産業技術総合研究所, 計測標準研究部門, 主任研究員 (30357917)
FUJII Kenichi 産業技術総合研究所, 計測標準研究部門, 首席研究員 (50357901)
水島 茂喜 独立行政法人産業技術総合研究所, 計測標準研究部門, 主任研究員 (60358091)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
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| Keywords | 基礎物理定数 / 標準 / アボガドロ定数 / 光周波数制御 / 超精密計測 |
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| Outline of Final Research Achievements |
The kilogram is currently defined by the international prototype of the kilogram. To redefine the kilogram based on fundamental constants, a two-dimensional dark fringe method to measure diameters of 1 kg Si spheres has been developed and a 28Si-enriched crystal has been used to determine the Avogadro constant by the X-ray crystal density method. The volume and mass of two 1 kg 28Si spheres have been measured by using a laser interferometer and a vacuum balance, respectively. The surface of the spheres has been analyzed by a spectroscopic ellipsometer calibrated by X-ray reflectometry. The Avogadro constant has been determined with a relative uncertainty of 2.0E-8. This is the most accurate value directly determined experimentally to date, resulting in a strong trigger to conduct the redefinition of the kilogram based on the fundamental constants in 2018.
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