| Budget Amount *help |
¥40,300,000 (Direct Cost: ¥31,000,000、Indirect Cost: ¥9,300,000)
Fiscal Year 2017: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2016: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2015: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2014: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2013: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| Outline of Final Research Achievements |
The purpose of this work is to determine the (anti)proton-to-electron mass ratio, one of the fundamental constants, to high precision by means of laser spectroscopy of antiprotonic helium atom (a metastable neutral atom consisting of an antiproton, an electron and a helium nucleus) . The work was done at the antiproton decelerator facility (AD) of CERN.
By comparing the transition frequencies of several accessible transitions to those obtained by the three-body quantum electrodynamics calculations, we determined the antiproton-to-electron mass ratio to a relative precision of 0.8 ppb (parts per billion), i.e., as precise as the proton-to-electron mass ratio recommended by the CODATA2010 fundamental constant adjustment. The result was published in 2016 in the Science magazine.
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