High-precision evaluation of the magnetic moment of the helion |
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Authors: | Yu I Neronov N N Seregin |
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Institution: | 1. Mendeleev All-Russia Research Institute of Metrology, St. Petersburg, 190005, Russia 2. St. Petersburg National Research University of Information Technologies, Mechanics, and Optics, St. Petersburg, 197101, Russia
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Abstract: | NMR spectra of samples containing a mixture of hydrogen deuteride HD with pressure of about 80 atm and helium-3 with partial pressure of about 1 atm are analyzed. The ratio of the resonance frequencies of the nuclei, F(3He)/F(H2), is determined to be 0.761786594(2), which is equal to the magnetic moment of the helion (bound in a helium atom) in the units of the magnetic moment of a proton (bound in molecular hydrogen). The uncertainty of two digits in the last place corresponds to a relative error of ??F(3He)/F(H2)] = 2.6 × 10?9. The use of the known calculated data on the shielding of nuclei in the helium-3 atom (??(3He) = 59924(2) × 10?9) and on the shielding of protons in hydrogen (??(H2) = 26288(2) × 10?9) yields a value of ??(3He)/?? p = ?0.761812217(3) for the free magnetic moment of the helion in the units of the proton magnetic moment. |
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