| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2013: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
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| Research Abstract |
The ground state hyperfine splitting of positronium is newly measured to check the discrepancy between the past measurements and the QED prediction. In this measurement, the timing information of positronium is used for the analysis. The uniformity and the stability of the magnetic field is also well-controlled.
The obtained result is 203.3942+-0.0016(stat.)+-0.0013(sys.)GHz. This result favors the QED prediction within 1.2 standard deviations, and disfavors the previous experimental average by 2.6 standard deviations. It is also found that the effect of the thermalization process of positronium cannot be negligible in the precision measurement.
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